Grandia II
God of War (all)
Knights of the Old Republic (I loved both)
BioShock
Edit: I am a big 360 supporter on this site, but Mass Effect's story is kind of overrated. I was highly disappointed with the antagonist's motivation and the plot. Loved the gameplay. Hated the Mako also. Hope Mass Effect 2 has a really engaging and interesting story.
I'm not a fanboy, I just try to tip the balance in favor of logic and common sense.