In Oblivion there were loads of quests for the guilds and when you became guildmaster you felt like you earnt it (Well I did) but on Skyrim the questlines for the companions which I've done and it didn't take long, which is a shame.
cant comment on that YET. so far, the collage of winterhold quests seem alot more enjoyable than the mages guild though. I enjoy how there's more of a story and the locations you visit are more enjoyable. like all other quests and areas though i know they're of limited supply which is the one thing i hate in ES games the most, that it will eventually end lol. im savouring every moment.