The music in
Timesplitters 2 is so perfect! The Neo Tokyo 2019 theme is just beautiful and flows with the stage and your stealthy actions in the first half of that stage! The remixed Astrolander theme... <drool> Most, if not all, of the tracks in
Timesplitters 2 can be danced to, especially the "Return to Planet X" theme, which I actually threw on an electronica/techno mix CD for a party and everyone loved it (a few people knew where it was from, too

)!
Aside from the plotline of the game, which is a bit flaky, the single-player mode is alright, but the co-op mode OWNZ -- that's how I managed to unlock the last stage for multiplayer use, by completing the game in co-op mode on Hard. Besides, certain stages in single-player mode are just SO MUCH FUN to do (the Wild West stage and Neo Tokyo 2019 are my personal favorites for gameplay).
To keep a long story short, this game is the true successor of Goldeneye 007 for the N64, hands down. If you don't own it, buy it, it's that simple.