I haven't played a lot, but my faves are definitely Planescape: Torment and the Bladur's Gate series. I also kinda love Icewind Dale, though I still need to dig into part II. Neverwinter Nights was terribly lame until the expansions came along. Those were awesome. Basically, I love the D&D games and it's a shame there's so little of them these days. I've also started Morrowind and I really did enjoy it but I just had to stop playing because for some reason it started to make me feel sick