Favorite FPS

I'll start.

1) Farcry 3
- Had the best stealth mechanic I have ever experienced within a FPS. The multiple ways to be able to play any mission caused me to hold this in high regard. Your character's development as he slowly desends into insanity and the thrill of the kill kept me hooked on the story. Ultimately I view this as the ultimate FPS, all should work to equal or surpass this.
2) Combat Arms
- A rather simple MMOFPS that has some of the greatest guns and maps I have ever used. The map Oil Rig is one of the most enjoyable, counter-offensive, maps I have played to date. Beware though, this game is a micro-transaction whore. Protect your wallet.

The only FPS I really play is TF2. I ususally just play as spy.

TF2: Mainly as Pyro

I like the Metroid Prime Series as well, although it is single player, its still an FPS.

I like so many FPSs.
Where to start...
1) golden-eye 007
2) battlefield series
3) CoD series (even though there are plenty of complaints, it's still carefree fast paced
games)
4) TF2 (sniper OP)
5) Metroid prime (really wish the multiplayer was more popular)
6) Combat Arms (got a little tired of the power of cash, as well as excessive hacking, but
zombies were fun as hell)
Halo series were good too, but I have never owned an xbox