I think I would have loved this game if it had been a bit shorter. As it was, my rating dropped about three points from, say, the second chapter or so to the end. The repetitive side quests played a role in that (although you could say that a number of those were of the optional sort you weren't required to do) and most of the end-game was just hard for me to get through. While the student festival was a cool thing as far as making the world seem alive and real, when you're fatigued a bit by a game, having a couple extra hours of stuff to get through that's little more than world-building can get a bit painful in that "I just want to finish the game, not take dates to a bunch of exhibits and then sit through concert preparation skits and the concert itself!!!!" sort of way.
I think the thing that most told me that things had stopped working out for me as they had been was just how much mileage I got out of the "restart battle with enemies weakened" option against bosses down the stretch. Early in the game, I didn't touch it, even against the fairly early Old Schoolhouse boss that's pretty tough. First time I brought it out was against Nosferatu, as his helpers were just wrecking me. And then I was basically wielding that as a weapon in the C6 battle with "C" and the final boss of the Old Schoolhouse in that "Oh, these bosses are tough and have help? Well, let's neuter them into helplessness!" sort of way. When I've reduced myself to the "remove all difficulty; just coast through" stage, there's a good chance it's because I'm tired of a game, but I've invested so much time that I'm not going to simply abandon it.
It's too bad. I really liked a lot of this game. The large cast of characters, with TONS of them having some sort of significance, even if it was just something minor like the one student who gets more and more frustrated due to being outdone by the jerk noble upperclassman at fencing until his noble friend comes for help because he won't talk to her any more because he's projecting his hate for that guy on all nobles. The entire Crow plot arc was well done, I thought. I mean, if Rean can play the typical "epitome of awesome" RPG protagonist by making friends with everyone and being great at solving problems and stuff, why not have an antagonist who can fool everyone all of the time, as well? Especially when they do so by being such a dedicated slacker that no one would assume they're a criminal mastermind.
Do have to laugh that you mentioned Crossbell as one of those things where you are out of the loop if you start with this game. When they went independent and characters were talking about how some bank guy was behind it, well, that was one of the times I did go online to figure out who the hell they were talking about.
I'm not afraid to die because I am invincible
Viva la muerte, that's my goddamn principle