Let me tell you, did you honestly believe that a guild called the THIEVES guild would be good? The Oblivion TG has spoiled a lot of people into thinking the TG was morally righteous even though Oblivion was the only game in which they were like that compared to how they acted in the past games before Oblivion.
I swear the same thread pops up every day. What, you are mad that you can't be the ultimate paladin who shoots rainbows and gives free ice cream to everyone? If that's the case then remind me to never play games like GTA4 with you.
Honestly, people expect to be the most moral person on the planet yet still expect to be given everything. Guess what, life doesn't work that way and expecting every company to cater to your needs and wants is foolish. The TG questline wouldn't be as great if you were forced into being good.
Even a poll from before the game was released showed that people wanted a darker TG.

