i wish that the other guilds had done just that. had i know that the college questline was so short i would have spread it out more with sidequests. as it was, i was archmage before i knew it. they should make you do at least two sidequests in between main quests or maybe make you wait a couple of days so you time to do something else.
But thats kinda what I'm saying...they only let you do one side quest, then you
have to do a main quest for them. You can't continue doing radiant or sie quests to continue. To proceed in the guild you must do a main quest.
For instance, I did almost all of the side quests, before completing the mq at the College of Winterhold. In the Companions you can't do that.