I know a lot of people really hated the Thieves Guild because it didn't make you feel like a theif, not really. However, it did make you feel like part of mafia of sorts. I mean, threatening people in the beginning because they don't pay their debts to the TG? Or putting competitors out of buisness because they interfer with the boss's (Mavens) profits? I mean, I didn't feel like a thief, but I did feel like a criminal, which is what counts. I also thought the whole story of revenge and betrayl was one of the better stories told in the game. And the whole, everyone knows the TG hideout its so unrealistic thing? Yeah, in real life, in high crime neigborhoods, everyone knows who the hardened gansters are, but the cops don't have the manpower to do anything.
Although, I will admit, the radient quests were painfully bad.