I think that the OP meant to say
COD 4 > Black Ops, MW2, and EVERYTHING
No I think he meant to say something more on the lines of this:
StarCraft II > Age of Empires II > Age of Empires III > Age of Mythology > Age of Empires I > Battlefield Bad Company 2 > Battlefield 2 > Battlefield 1942 > Call of Duty 4 > Call of Duty Black Ops > Call of Duty Modern Warfare 2
No wait, that was me and my honest opinion. :>
Modern Warfare 2 is the worst, not even properly done for PC -neither is Black Ops, which makes them both incredibly bad. SCII has competitive gaming and is incredibly fun. Age of Empires I, II, III and AoM are all very educational as well as fun (although I don't see many CoD players seeing a possible blend there, can you?), and then CoD4 has ProMod and is also well orientated for all platforms (as well as Freeze Tag and Obscurity).
Oh, I may have forgotten a few like CoD: WaW, all other Battlefields, Crysis, Armies of Exigo, Warcraft series, World of WarCraft, Bioshock, Amnesia: The Dark Descent, Far Cry, Prince of Persia, Pokémon, Lego Batman, Tetris, Pac-Man, Asteroids, Just Cause, Crysis, Act of War, Operation Flashpoint, Brothers in Arms (Road to Hill 30, Brothers in Blood and Hell's Highway), Black Hawk Down, Mass Effect, Mass Effect II, Dragon Age: Origins, Red Alert II, Command and Conquer: Generals, Fable I, Fable II, Prince of Persia: The Sands of Time, The Settlers: Rise of an Empire, The Settlers: Heritage of Kings, Serious Sam II, Assassin's Creed, Magicka, Alien Swarm, Zero Ballistics, Urban Terror, Osmos (Demo), and League of Legends.
I definitely have more games I've played, but the free ones are incredibly fun, which are:
Alien Swarm
League of Legends
Amnesia: The Dark Descent (only a Demo mind).
Magicka is £8 and amazing, Amnesia is £13 and many say (and I can't exactly disagree given videos etc on YouTube) it's the scariest game they've played.
Oh, I forgot Halo 1, 2, 3, ODST and Reach. That's a story for another time.
Anyway. Some free games are better quality and I'd even say that some mods on StarCraft II are better quality than some CoD games. That's how bad they are.
- H