What do you find to do after 350 hours?
Im 70 hrs in and I find pretty much everything repetitive, almost ALL quests involve you to get into a dungeon and kill things, and dungeons are just plain boring and stupid anyways.
70 hrs are probably "little" for you,but i think that for Bethesda even 50 hrs of "average time" would be a victory.
And by the way what other game of this genre you think isn't repetitive after that you've played it so much ? dungeons are mandatory in this type of games; the way they're implemented perhaps is debatable,but some of them are remarkable in my opinion,probably you were unlucky in your playtroughs.
However, i'm convinced that in 70 hrs its impossible to judge objectively this particular game -as how strange it may seems you can find new interesting places/things even after 250-300 hrs.
i.e. I've discovered only yesterday two of the 4 divine quests that i haven't still played,"The Book of Love" and "Kyne's Sacred Trials" - one of which involve a totally "new style" of playing