I haven't heard a word from anyone who's played the 360 version of UTIII. Not too many people are big fans of the series it seems. The 360 version kind of came in with zero fanfare given the time gap between the PC and PS3 versions.
It's a fun death match game with GoW style graphics since it uses the same game engine, and particularly good for online matches which is important since the single player campaign is somewhat of a joke.
As for puzzle games, there are quite a few on XBL Arcade. Zuma, Bejeweled are a couple I can think of off the top of my head. Most of them have demos so you can try before buying the full version.







