Best FPS on the system?

I'd just like to hear different opinions from everybody. Every game has pros and cons, so what makes your favorite the best?

EDIT: This is strictly from a Multi-player (PvP) standpoint.

What makes Bad Company 2 the best in your opinion?

i would have to say Battlefield Bad Company 2, only just picked it up recently, and it is way better than anything else i have played

The game looks great, I haven't tried it. So, what makes it the best?

What makes Bad Company 2 the best in your opinion?

VeeArSick

MW2 and Metro 2033

Halo 3(soon to be overtaken by Reach). Reasons the matchmaking is fast. Forge,theater are awesome and custom games are really fun. Very accessible to new comers because you play people on your rank instead of playing some one that has already been playing the game for about a year.

Team Fortress 2 and Shadowrun. They both heavily rely on teamwork and are excellent games overall.

I've never played Team Fortress 2, however, I didn't care too much for Shadowrun. The game was a little too fast paced and bland. The controls didn't feel very good and the abilities were interesting, to say the least.

I enjoy Halo 3, but I think the game has a lot of glitches/mistakes. Examples: Sticky Grenades going through enemies. 2-3 Sword lunges to kill somebody. The sword not lunging at all. Multiple headshots (3-4) to kill enemies. The list of "poop" that seems to pollute the battlefield on this game is very large. Don't get me wrong, I do enjoy Halo 3, but I could definitely do without all the "poop". :)

I can't say much on CoD, where I haven't played much of that either.

MW2, yes it has alot of thrash in it, but I have fun playing it with my friends.

BFBC2 because its about working with a team and all of the destruction.