This game is easily worth $25 if you have Live. The lag is alot less then it use to be, although It still lingers. Probably the second best fighter over Live behind Capcom versus Snk 2, but unlike CVS2 it has a better setup, more fair ranking system, and allows other people to watch your games being played amongst lots of other goodies.
Check out the reviews, most people gave it postive reviews. The only thing that sucks about the game is the slight lag on Live, and that they tweaked some characters like Leon, who owned in DOA2 but is now too slow on the XBox version of DOA2.