Not really considering there's multiple other quests to do. The MQ is barely the point of the game. Though the Guild Quests (at least The Companions and Winterhold) definitely need to be beefed up.
I agree its not the main point.
But it should be lengthy and epic.
I think the main and all the faction quest need more added to them.
I can play this game for well over a thousand hours alone.
That does not mean they should severely cut down the main and faction quest length.
Its just atrocious, and there is no cause for the diminishing of quest lines and fun features that this series used to have.