I dont think it is bad quest design IRL people don't just give you information, nor can you get to people wit information without having to join a group.
Right. And even if you do join the college, you're under no obligation to actually do anything for it.
I did hate the Thieve's guild part, though, but that has more to do with the stupid structure of the Thieve's guild itself more than the forced referral to them for the guild - There's no way to dissuade Brynjolf of his illusion that you're some kind of dirty pickpocketing thief, and there's no way to kill or intimidate him for making such libelous claims about your character.
Where's the dialogue option: "No, Brynjolf. Actually, every one of my coins is earned either honestly, or from killing those [censored]s out to world a worse place than it already is - People exactly like
you. I was willing to just buy the information you had. However, now I'm thinking of reserving that for paying off the fine for murder if you don't tell me what I need to know."