games are the only reason I have XP on my home machine. Missus is as happy as me using Firefox and thunderbird in Linux, as she was in XP. I doubt she knows or case what Linux we use, which some might say is how it should be
But if I got rid of Xp all together she'd be annoyed at not being able to play Sims 2 or Bioshock. I've read World of Warcraft is very playable in Linux using Wine, and a friend plays GTA 3 in Wine, but I'm not sure about many more recent games, I think it's the DirectX speed which is the problem.
it's a bit old now, but a friend recently got Prey for Linux, from what he said getting it to run is much like Quake and other old id games were under Unix variants, i.e. you buy the PC version, copy the files you need off the CD, dl the appropriate Linux files, and you're away.
http://2dboy.com/games.php
World of Goo has a Linux version available, it's good fun.
wine in general is very useful, I use it for apps like digiguide, where there isn't a Linux equivalent. Digiguide's own site even suggests Linux users use wine and tell you what you need to do to run it.
Apart from games, the only other MS Windows apps I think that struggle with Linux under wine are things like software for pdas and phones. But there's a fair few mp3 programs which I'm told act similarly to itunes. I've never used itunes so I wouldn't know how close they are but amarok is popular.
---------- Post added at 19:23 ---------- Previous post was at 19:17 ----------
Just found this, doesn't look like you'd be playing Crysis in Ubuntu
http://appdb.winehq.org/appbrowse.php?catId=2