Online is horrible (PSN version)... MK1 is the only tolerable game to play online. MK2 and UMK3 feel like they're running at half their normal speed. Other than that, the games feel fine offline though. I won't be surprised if this gets canned on tomorrow's Thursday Night Throwdown. (Maybe at least play MK1 on either PSN or XBLA)
Yeah - I need a new party game (even though there are probably better choices coming out later this fall). Might as well get the underdog of the bunch. The lack of early reviews have me a bit worried whether or not the final game is good, but we'll see.