I have 190 hours clocked in, am still not bored of the game (I don't do a lot of quests/dungeons so there's a bunch of dungeons I haven't even explored) and I haven't even got Dawnguard yet. I'll probably get bored after 250+ hours, I think that's quite worth the sixty bucks I payed for it.
Let me quote a wise sage named Frank: "Computer LARPing was defined here as "pretending to do something that doesn't have any effects on the gameworld". Like playing Oblivion and pretending to be a noble and dressing up in fancy clothes and only traveling on horseback and only using silver weapons because that's what nobles do, even though it makes no sense gameplay-wise at all."
I couldn't agree more. Grinding all crafting skills, wearing all dragonplate armor and using daedric weapons, enchanting gear, maxing out OP skills like sneaking, while clearing dungeon after dungeon and not giving a hoot about the storyline is SO much more fun. It's also the only way to PROPERLY play. Everyone knows that.