No fighting game is ever completely truly "balanced" but MvC3 is not nearly as bad as MvC2 god tier Magneto/Storm/etc.
Most Sentinels online are massive spammers (from what I've seen) so really, you shouldn't worry about Hulk being overpowered....it's Sentinel you gotta worry about.
Most Sentinels online are massive spammers (from what I've seen) so really, you shouldn't worry about Hulk being overpowered....it's Sentinel you gotta worry about.