How is the multiplayer for this game?

Do enough people still play it?

I just recently bought a 360 with cod4 and halo 3 and i am interested in playing fps games on xbox live.

I want to get some more games and I was wondering if these games are still popular and a good amount of people still play them:

Unreal Tournament III

Team Fortress 2 (in the Orange Box)

Battlefield Bad Company

I would also like you to recommend me some other good multiplayer games on xbox live.

I already have cod:waw for my pc so i don't want that on the 360.