Most single player games kill single player UT3.  Any UT is still is the better multiplayer.  I got Warhead and the original Crysis.  I like Crysis better than Crysis Warhead though.  Gameplay is a little better but the storyline is worse.  It's like the original Half Life vs Opposing Forces and Blue Shift.

If you have the multiplayer game (Crysis Wars or Crysis) we can play on some servers.  Power Struggle seams to be the most popular gametype although they do have Deathmatch (Instant action) and Team Deathmatch (TIAction) servers out there.  It's pretty much the same few maps over and over- much less choice than stock UT3.  I'm sure there's a crack download via torrent.