1. Dungeon crawls are fun.
2. Trap detection actually works.
3. The laughs. (see below)
4. Abilities are just about right, requiring some managing and planning but not micromanaging trash mobs.
5. Smooth performance - Some have had issues, I haven't had any.
6. The story.
7. The quests are at least average or better.
8. Voice work is decent. (correction) very good.
9. Companion comments.
10. Companion AI (and ability to turn it off)
11. The sound effects. (except when the summoned creature disappears/'dies"-- poor thing)
12. Graphics are fitting and nicely done, also fit the mood of the game.
13. Combat is fun and not a chore, but not so easy to let it run on auto-pilot.
14. 360 degree view -- newer games in this genre don't always have this.
15. The loot descriptions.
16. Hunting/exploring to meet some objectives.
17. Being Waylaid!
18. Music is very nice - subdued but fitting and top notch.