The Legend of Zelda: Ocarina of Time
Uncharted 2: Among Thieves
Marvel vs Capcom 2
Resident Evil 4
Tecmo Super Bowl
Legend of Zelda
World of Warcraft
Unreal Tournament 2004
Splinter Cell: Pandora Tomorrow
Killing Final Fantasy X. As a Final Fantasy fan, this game truly hurt. The story was cringeworthy levels of cheesiness with romance that made no sense and felt like it was written by a 14 year-old boy and bad character development that didn't give me a single reason to care about any of the cast members. They tried to flesh out Auron's and Jecht's past, but it was tact on and wasn't integrated naturally within the story, while the rest characters were shallow. Now, a bad story with shallow characters isn't new to FF, but this one really outdid itself and at least other FFs had the gameplay to fall back on. This FF, however, chose a vastly more linear approach to prior FFs in favour of it's poorly crafted story killing the enjoyment of exploring an original fantasy world and finding secrets. It's the only FF other than XIII that I didn't really enjoy (so far). It's only saving grace was it's battle system, which wasn't anywhere near good enough to redeem the whole experience.
I'll have to champion Final Fantasy VI as it is an example of a good, strong FF. With great characters like Celes who has relateable weaknesses and struggles and she deals with them as you progress through the game (SPOILER: including attempted suicide) and Kefka, a nutty, unpredicable villain who SPOILER: actually sorta achieves his goal in destroying the world. Also the gameplay, with the awesome ATB battle system and lots of party members to recruit (many of which are optional later in the game) with surprisingly varied playstyles for a turn-based RPG. Also, once you hit SPOILER: the World of Ruin the exploration is goddamn magnificent! And let's not forget that Opera Scene!