COD4 by a million...But that's just my opinion...Haven't tried Team Fortress 2 and Halo isn't my style but if you like Halo style multiplayer then Halo 3 is a great package.
CoD4 and Halo 3 are about equal in gameplay fun,CoD4 is realistic more like GRAW but Halo 3 is Halo what more can you say about Halo, both games have over 100k players online most of the time and will be around for 6 or 7 months if not a year before they get dethroned.
Halo 3, TF2 is just boring imo and it isn't drawing my attention away from Half Life 2. COD4 is decent but nothing new, i played the beta. Halo 3 is fun for about 3 weeks then gets old. But yeah i'd say Halo 3. But get OB for Hl2 & Portal.
I own all 3, and i have to say that i really think Halo 3 is best. It is just more fun than the others. I also have played it a A LOT and have not gotten bored.(I currently have a little over 8000 kills)
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