Elder Scrolls 5: Oblivion

[Majik]

They added alot of new thief stuff like having to actually pick locks instead of just click on them with a tool, and getting backstab bonuses for being steathy. Of course, they countered that by making EVERY NPC in the game capable of recognizing stolen goods. The only place you can sell something stolen is at a thieves guild, and unlike Morrowind where those were on the corner of main street, I have yet to find one.