Skyrim V: Skyrim

[Androgeus]

I think Morrowind did a pretty good job at setting up pacing. It helped that your progress in guilds was limited by your skills, so at some point you had to train. I kind of miss it, to be honest.

The main quest even tries to encourage you to do the guild quest lines by telling you to build a cover story.
It may be a bit lack on the pacing at the start of the main quest though, seeing as all you are doing for the first 4 or 5 quests are fed-ex quests to gather research notes.