I really enjoyed the Companions quests. Haven't played the Mages' College, DB or Thieves' Guild quests.
I also enjoyed them, but was speaking more generally about all of the Guilds. Come to think of it, they all had pretty nice
stories but were akin to watching that 1 hour movie when you just knew it would have been better as a full length film. College of Winterhold probably exemplifies this the most.
Truth be told, I'm pretty sure most of the guilds in Skyrim were starting points for TES VI when it comes to story. Where Skyrim was 200 years past Oblivion, I think that TES VI will be pretty close to this timeline.
Depending on what DLC holds I guess.
