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This is yet another one. So let's get started.
1. Halo Series
2. Gears of War Series
3. Call of Duty (specifically CoD 4, WAW and MW3 when it's playable)
4. Left 4 Dead series
5. F.E.A.R series (the first one was scary as fuck, second one sucked though, but haven't played the third one yet)
6. Aliance of Valiant Arms (my favourite online PC FPS game atm)
This will be the last type of thread from me so yeah, please post your favourites as well.