As much as I want to love this game, I just can't. The balance is so brutally off. Seeing as I'm more of a Capcom fan than a Marvel fan, I just get tore up if I don't play as characters I don't like. I'm good with Felicia, Cammy and Zangief, but good will only get you so far when you fight any team that has Magneto, Sentinel, Storm or Cable in it.
Also, all the glitches I've encountered are really a knock against this game. What with Felicia being my primary, I use 'Please Help Me!' a lot, and I guess having that many characters on screen at once makes the game freeze a lot more easily than with any other character. Plus, it seems that every time I have someone disconnect while on the character select screen, it just stays on the "Player has disconnected' screen forever. I've let it sit there for at least 5 minutes and it never went away.
I'm still playing the game nigh constantly. I want to get good enough that it won't matter that everybody uses completely broken characters - I just don't think it's ever going to happen. I guess I'll just keep playing it 'til I at least get the 100 Wins trophy.
... I wish they would re-release the original Marvel vs Capcom and give it this Marvel vs Capcom 2 treatment with online multiplayer and HD Smoothing. It may not be as popular, but at least when I win or lose, I know it was because of skill, not because of character balance.