Final Fantasy X is tied as my favorite game of all time. Funny enough, the game it’s tied with came out on Xbox.

Worth mentioning:
Final Fantasy XII
Kingdom Hearts I & II
Ratchet & Clank (all)
Tony Hawk’s Underground
Champions of Norrath: Realms of Everquest
Arc the Lad: Twilight of the Spirits
Burnout 3: Takedown
Rock Band
NFL Street
Amplitude
X-Men Legends