It's the best fighting game on the planet! If you've already got this game in another form, though, and you aren't obsessed with it, then there's no real reason to upgrade.
Without a doubt, the closest thing I've ever seen to a game that approximates a real honest-to-goodness game of pool...There is honestly nothing that you could want in a pool game that you won't find here -- well, with the exception of stale cigarette smoke and a fistfight or two.