Do you like Japanese RPGs? Lost Odyssey, Resonance of Fate and Infinite Undiscovery are all very good. Tales of Vesperia too. Lost Odyssey and Infinite Undiscovery are quite old but they are 360 exclusive.
For western RPGs, I would suggest The Witcher 2 and Divinity 2. If you are getting Divinity 2, though, make sure that it is DRAGON KNIGHT SAGA and NOT "Eco Draconis". Eco Draconis is the old version and it's very buggy and stuff. Dragon Knight Saga is a rerelease which fixed a million of bugs and glitches and even improved the graphics AND added a new chapter to the story which follows the events of the game's ending.