sneakcity: I picked my favorite when I picked my picture on gog - it's the cover of my favorite game, for those who want a puzzle.
But I noticed a few themes reading through these posts:
1. Enemies who survive blackjacking (robots, zombies) are the least popular. Either the atmosphere was spoiled by zombies, or spoiled by robots.
2. People who picked Thief 1 favored it's story and atmosphere. It really was a dark project, in many senses.
3. People picking Thief 2 liked the level size, and the improved engine. They got more out of each level.
Fantastically written, both games had things that spoiled it, monsters or robots. But thief 2 built upon TDP and added more gadgets, larger levels, an improved engine. But best of all geared more towards being a thief than fighting and sneaking your way through dungeons. That was what i liked so much more about T2. I felt like I was doing more thievery than TDP. I also enjoyed to atmosphere of T2 including the soundtrack.