I agree with Archie 100% on all the newer CoDs. MW1 was great, Single player that is, but MW2 and the newer ones have just ruined it, put in a new generic story with new textures ans called it a game. More like an Over-Priced Mod.
And on Fallout: 3+NV Yeah, they had their problems, but they were enjoyable, and Yes, VERY mod friendly. Almost everywhere you went was open world, and randomly scripted events, and then The wacky wasteland perk made it even better. I'm surrently kicking myself in the ass for buying Audiosurf then the new Old World Blues DLC. Bethesda Softworks is a MUCH better Developer then Infinity Ward and Treyarch, Bethesda makes beautiful open world environments, and then LETS YOU CREATE YOUR OWN ENHANCEMENTS.
And the player bases of each game differ as well. When a person starts playing CoD, or asks a question about the game, they get "FAG STFU GET MORE KILL STREAKS IM 5TH PRESTIGE WAT R LVL 5?". When someone goes on the Game forms for Oblivion, when asking how to mod, instead of getting "LOL GOOGLE IT U FAG GTFO", they are greeted with Very Nice people, sometimes Employees THEMSELVES, pointing them in the right direction. I personally found Bethesda G.E.C.K tutorials VERY helpful. I made a machine gun that fired Shotgun Shells. and a Nice clean Vault with is entrance in the back of a truck.
Should probably clean this up to be neater, but to lazy