There was a thread just like this one last night...
I'll copy and paste my post.
On subject, MW games, I tried to play the first round a freinds house, I got so bored I gave up slightly after when the nuke's dropped. I watched the same freind play though the second, he completed it in an hour and half. I think that any game that doesn't have a single player that takes ATLEAST a whole day to play though isn't worth a £40-£50 price tag. He still plays the multiplayer, but it dosn't look like it apealls to me at all. Tiny cramped maps were every gun fight is a fastest finger first or whoever gets a grenade off first? I'll pass thanks and stick to Resistance 2, a game with a far better multiplayer in everyway. The only good thing about MW2 is the spec ops, but is game really worth a new realise price tag (that it and even MW1 still have) when you're just buying for what is essentally a gloryfied mini-game?
Also:
Spore
Anything Mario related
Force Unleashed
Empire at War (The only good thing about this game is the mods)
Battlefront 2 (Again, above)
WoW
Unchanted (I can't really comment though, because I only played a demo and seen some gameplay of the 1st one)
H.A.W.X.
Halo (I got bored of the 1st one and gave up, never played the second and the 3rd + ODST were just "Meh").
Eve (Still not as good as Freelancer online).
Army of Two
Devil May Cry 4 (the 1st two were amazing).