Favorites for me would be:
KOTOR - Loved every moment of it, played it many times. Never gets old for me, sequel was a huge disappointment, but not bad by any means.
Battlefront 1 & 2 - Fun shooters, I like them both equally, because even though 2 had some interesting additions, it introduced alot of problems.
Super Star Wars series - Nostalgia mostly, first games I've ever played.
Galaxies - Great until they fucked it up.
I hated Force Unleashed (the game was borderline decent, until the Star Destroyer scene), and the Episode I game was mind numblingly bad.