I downloaded it when it became available on Xbox 360, and completed the main game in under 2 hours. I haven't been compelled to return to it since. It just felt like they were beating a dead horse at this point, because the Robot Master stage designs were easy to navigate, most Robot Masters were pretty lame, challenge-wise (I never even used a powerup!), and half the music was garbage and forgettable. The sad thing about that last part is that it was a combined effort by composers that worked on the previous Mega Man games. The Wily stages were the only challenging and enjoyable aspect about the main game, and even then, it came off pretty lazy. Fighting past Robot Masters could have been cool, but they managed lame it up by making you fight floating, spiked boxes that just happened to have their abilities. Hell, Mega Man 3 at least gave you a robot to fight against when this happened!

Yeah, there's a Hard mode, challenges, and tough achievements, but they feel tacked on to make the main game appear like it has depth.