Where is this on sale?
This is 15.99 right now, is it worth it?
Definitely worth $16 if you like the Vs. games. It's a good (not great) Marvel game with decent single player content but the cast kinda sucks (80% carryover from Marvel 3) and 6 of the new characters are locked up behind a $30 DLC paywall.
Seconded. It's game engine is a new take on things (being able to tag whenever you want)
KOFXI (unless you mean w/o requiring meter)