You have a few errors throughout this review, though only a few that I figure you'll likely want to update. The most obvious is that you call Bubble Man by the wrong name (you call him Water Man, which is incorrect). Also, he attacks with harpoon shots underwater. You just happen to receive the Bubble Lead as a weapon that you can use yourself (this is more prevalent in later games, where bosses often have 3 abilities and the game randomly gifts you with perhaps the least interesting one).
You also don't have to lose all of your lives if you die in the wall cannon stage in Wily's Castle. The checkpoint where you reappear is right next to a group of three enemies that are easily killed for power-up refills, so it just takes a few minutes--at worst--to refill the Crash ability and then you're good to take out the cannons. As you noted, it's also possible to use the lift platforms to do it all in one shot, but I never really go that route since the other option is such a piece of cake.
I wasn't even aware until just recently that you could use the trick of rapidly pausing and unpausing the game to avoid taking damage, mostly because that's unnecessary. I also find that Mega Man 2 is no less forgiving when it comes to using the right weapons on the right bosses than any subsequent Mega Man games were. If anything, it's more generous. That's helpful when you have to defeat the robots again in Wily's castle. I love taking Crash Man out with a shot or two from Air Man's weapon, for instance, and taking out Metal Man with a single one of his own blades. That leaves you with six more challenging boss encounters, but Flash Man is easy as pie and Quick Man is cake because it's not like you need the Time Freeze move at that point, anyway. Wood Man has never been a difficult boss, either, and Air Man is easily taken out with the Leaf Shield, which just leaves the very simple Bubble Man battle and an only slightly more difficult confrontation with Heat Man.
Your complaints from some of the stages also rung a little hollow, though of course I wouldn't call them errors. I'll agree that Flash Man's stage is fairly simple and mostly devoid of enemies--as it should be, since it's the stage most people will reasonably tackle first--but Wood Man's stage has always been one of my favorites for the sheer variety (plus the music rocks, but you mentioned that).
I won't argue with you about the lava pit in Heat Man's stage, either. If you're determined to disapprove of Mega Man 2 for making things much easier on you if you tackle the stages in a certain order, well... I guess that's your right. I just do Air Man's stage first most of the time. As for Quick Man's stage and the Time Freeze, it's not like Quick Man is a particularly difficult boss, but if you do have trouble with him, you can always fill up the Time Freeze by taking out enemies in the corridor ahead of him. That's a pretty simple solution that works like a charm, if you don't trust yourself to fight him fairly with just the arm cannon.
All in all, this review did a great job of outlining your particular preferences for Mega Man games, so I do come away with a good idea what you dislike about Mega Man 2. It's just that none of them have ever made much impact on my own time spent with the game. I also feel that you're in for a rude awakening if you revisit the later Mega Man games, since part of the basis for your low score seems to be that this game does some things poorly compared to the later games... when those later games commit the same transgressions with magnified impact.
So yeah, I am writing this from my place in the hostile audience you knew this review would reach, and feeling mostly like we played two different games. ;-)
You also don't have to lose all of your lives if you die in the wall cannon stage in Wily's Castle. The checkpoint where you reappear is right next to a group of three enemies that are easily killed for power-up refills, so it just takes a few minutes--at worst--to refill the Crash ability and then you're good to take out the cannons. As you noted, it's also possible to use the lift platforms to do it all in one shot, but I never really go that route since the other option is such a piece of cake.
I wasn't even aware until just recently that you could use the trick of rapidly pausing and unpausing the game to avoid taking damage, mostly because that's unnecessary. I also find that Mega Man 2 is no less forgiving when it comes to using the right weapons on the right bosses than any subsequent Mega Man games were. If anything, it's more generous. That's helpful when you have to defeat the robots again in Wily's castle. I love taking Crash Man out with a shot or two from Air Man's weapon, for instance, and taking out Metal Man with a single one of his own blades. That leaves you with six more challenging boss encounters, but Flash Man is easy as pie and Quick Man is cake because it's not like you need the Time Freeze move at that point, anyway. Wood Man has never been a difficult boss, either, and Air Man is easily taken out with the Leaf Shield, which just leaves the very simple Bubble Man battle and an only slightly more difficult confrontation with Heat Man.
Your complaints from some of the stages also rung a little hollow, though of course I wouldn't call them errors. I'll agree that Flash Man's stage is fairly simple and mostly devoid of enemies--as it should be, since it's the stage most people will reasonably tackle first--but Wood Man's stage has always been one of my favorites for the sheer variety (plus the music rocks, but you mentioned that).
I won't argue with you about the lava pit in Heat Man's stage, either. If you're determined to disapprove of Mega Man 2 for making things much easier on you if you tackle the stages in a certain order, well... I guess that's your right. I just do Air Man's stage first most of the time. As for Quick Man's stage and the Time Freeze, it's not like Quick Man is a particularly difficult boss, but if you do have trouble with him, you can always fill up the Time Freeze by taking out enemies in the corridor ahead of him. That's a pretty simple solution that works like a charm, if you don't trust yourself to fight him fairly with just the arm cannon.
All in all, this review did a great job of outlining your particular preferences for Mega Man games, so I do come away with a good idea what you dislike about Mega Man 2. It's just that none of them have ever made much impact on my own time spent with the game. I also feel that you're in for a rude awakening if you revisit the later Mega Man games, since part of the basis for your low score seems to be that this game does some things poorly compared to the later games... when those later games commit the same transgressions with magnified impact.
So yeah, I am writing this from my place in the hostile audience you knew this review would reach, and feeling mostly like we played two different games. ;-)
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world

