The innovation in this otherwise incredibly familiar port is touch control. Tap your opponent (front or rear panel) to slap, tap your gauge for a Hyper Combo or... no, that's it.
Stick to buttons - Vita's D-pad does a solid job - and this is authentic stuff. The rocket-speed three-on-three action is gorgeous, with big, bold character sprites.
Online works great so long as you're near the Wi-Fi router (or else it gets choppy) and it boasts uploadable replays. You can even share DLC with your PS3 copy - here, violence is golden.