- I didnt care for Fallout 2, but 1 is a classic
- I preferred Diablo to Diablo II (they are both must haves) unless you are looking at multiplayer
- Baldur's Gate II is better than the first (especially when you compare expansion packs) but they are both good. If you really want a long adventure, get the "Baldur's Gat Trilogy" mod which crams both games with both expansions into one super-game that plays start to end, running under the BG2 engine (so you get the higher res for BG1, which is a godsend).
- I consider Arx Fatalis a must play, I LOVED that game.
- If you can stomach the old (OLD) graphics, Might & Magic 6 and 7 are some of the best hack 'n slash games I've played.
- Planescape Torment, of course.
- this list needs more ICEWIND DALE.