Cheers to everyone who said Halo, haha... great games. XD
Anyway, last month my dad got me The Elder Scrolls V: Skyrim for the PS3 and I am now completely in love with it! In fact, I killed my first two dragons today! Great feeling, and the second one I fought was really tough and I almost died but I must say, that was probably one of the most rewarding fights I've had for a while regarding the awesome feeling during and after the fight. Even if you haven't played the others (although outdated, I still loooove TES IV: Oblivion, also a wonderful game) Skyrim is pretty easy for anyone to pick up, meaning you don't have to be SUPER into this type of game to really enjoy it. So yeah, my recommendation for games.
(warning, the game has a bit more blood in it, just in case you want to try it but don't like blood, just a warning)