Easy, I really like the gameplay, the crazy battle, the barrier system, the glorious overdrive mechanic that makes you go full Anime. Also is simple to play and learn (4 buttons) but really deep to master. Each character has his own unique gameplay mechanic (Drive) which set them apart from the rest. (I feel street fighter wanted to do the same with the V-gauge).
I like Guilty Gear for the same reason (highspeed combat, crazy combos, etc.) Also I never felt so much hype watching a fighting game.
Storywise... is like a really Edgy Kingdom Hearts anime but meh it works. The Gag Reels tho.