Hi all:
I never played Morrowind, so am not sure how it worked there (actually, UESP helped here). It appears that one can join the fighter's and mages guild by talking to the few appropriate people who can let you join as associate. I also understand thatsome factions are mutually exclusive - you cannot be part of 2 Great Houses at the same time, and also there might be conflicts between the Temple and other cults etc.
I am playing with Morroblivion v 043 (latest), and am trying to join the Thieves, Fighters and Mages guild. Unfortunately, I have been able to succesfully join the Fighter's guild only. The other guild members deny me admission because I don't meet their "requirements" - I am guessing these must be attribute/skill requirements. My Redguard blunt user is not skilled in Magic/Stealth, so I am guessing I am not qualified. Same thing with the temple.
Do you see this issue too? UESP does not indicate any such requirements. Not sure where these came from - Any thoughts?

Guild Requirements