Kotor 1 and 2
Neverwinter Nights 1 and 2
Akella's Pirate games (Pirates of the Caribbean (not related in any way to the movie), Age of Pirates, and City of Abandoned Ships.)
Diablo 1 and 2
Mass Effect 1 and 2
Dragon Age 1, 2 and origins
Sid Meier's Pirates
Lord of the Rings, the Third Age.
Also, NWN2 had a great storyline, better than Mask of the Betrayer.
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