I disliked the fact that nearly every enemy in the game has that running attack that always seems to get me while I'm already busy trying to dodge one of those Kang Jae Ho's head-thrust dash, the Shadow Law dolls spamming gunshots and the chun li/tetsu hadoukens. And there's the fact that sometimes, enemies are able to block Zangief's grabs.
Animations are fluid and the gameplay is superb, but as far as enemy attacks go, they need some nerfin'. Or else something like Fighter's History Revenge, where you can burst off and send enemies away.
This game is good, it just need to get rid of the constant dynamic entries to your back and Bison's army of waifus being untouchable because they've got guns.