Call of Duty 4. It's not that I hated it, but I honestly did not see why people were saying '10/10' and 'best game ever'. It was really just a standard shooter with decent graphics, a horrible single player and (I have to admit) incredible online. It added nothing new; it was as far from innovative as a game can possibly be, really. Sure, I had fun with it but I do not put it in my list of 'Top Ten Best Games I Have Ever Played'. That's right. Not even the top ten.
I tried to love it, I just couldn't.

Shadow of the Colossus. It got boring for me after the sixth annoying unreachable boss. Wait, it wasn't a boss. Those 16 massive lumbering... things were the only enemies in he game. Some warriors on horseback to shoot arrows at and plunge your sword into would have done wonders. I admire the artistic direction and, unlike the previous game, it is INNOVATIVE, but for me it was a little too innovative. I have to give that game another chance someday, dust off my PS2. But the first time I tried it, I didn't see anything special.

EDIT: There are people in the world who don't like God of War?

-GTA: San Andreas. That game just really sucked in my opinion.
-Metroid Prime 3 and 1. Just couldn't really get into them.
-Resident Evil Zero. I loved the first one but Zero, although it looked great, was way too boring.
-Prince of Persia: Sands of Time. It always felt like the game was only half finished.
-Viewtiful Joe 2. It started out nicely but couldn't keep my attention.

MP3 it got toooooooooo easy!!

For me -

All of the GTA games - I found them pointless and especially after 3, unoriginal.
The Halo series - After being a die hard Quake/Doom/Unreal player, Halo just couldn't hold up to it.
Metal Gear Solid series - Thief called, it wants its ideas back
The F Zero series - Its just lost on me, maybe because Im not a racing fan?
Final Fantasy 7-9 - Really, I don't need to watch a movie every time I cast a spell.

^^ you dont like MGS! o_0 It like THE best game on the world!!!!!!! Waaaaaay better than games like Zelda and MP3

Any 3D GTA - they didn't make the transition well IMO, everyone else seems to rave about the newer ones *yawn*

Any Halo - IMO it's generic, and it really has nothing that I look for in a shooter

Su Do Ku - Everyone loves them, whether a computerised version or not. Just because there are numbers in front of you, it doesn't mean you are doing maths - Su Do Ku are glorified find-a-word puzzles

Metroid prime series- I find it very boring to walk around a big (yet beautiful) world shooting bugs and puzzle solving..not my thing
GTA IV, San Andreas, Vice City- everything was a disappointment after GTA III
Halo series- while i find the multiplayer fun at times i feel it is a highly overrated series
Metal Gear Series- while i love the story and cut scenes i feel the gameplay is terrible
Half Life series- it's like metroid to me..go around a big world with very little happening around me..most of the enemies are blah

there are more just can't think of them rightn ow

See, I already played through the Thief series, pretty much where Kojima got inspired/stole the idea for MGS stealthiness from. So basically the MGS series was thief in a modern war setting to me, and modern war settings bore the crap out of me.

The Zelda games do an excellent job of creating an adventure, plus its more of a setting that appeals to me (medieval/fantasy).