Well lets see....
All of the Ratchet & Clank games ( Except for the PSP installment)- Up your Arsenal was a game I 100% for the first time, and for the whole series was a series I could not put down. Or something I would not get bored of very easy.
All of the Jak & Daxter Games ( Except for the PSP installment)- ^^
FFXII- Wow well I really loved the Graphics in this game, the Story was action paced and A-M-A-Z-I-N-G. I also liked how it was very different than other FF's and still be able to be really good.
Gears of War 1&2- The story was something I did not encountered for a good while, and was very awesome. The multi-player was brilliantly done for GoW 1 not so much 2 but updates and such fixed this I guess.
Halo- Marvelous story, that I played through with some of my brothers, always kept me entertained. As for the Multi-Player, it was a hit and a miss for me.
dude, i LOVE R&C 3 so much, i must've played that game 20 times, and i would've played more but my disc scratched. i've played all of them at LEAST ten times each, and i was so excited for the next one, then i found out about all 4 one. all 4 one. expect a full rant on that later.