That's their opinion, one I happen to share. Skyrim is, in my opinion, one of the best games I've ever played (It's among my top 5). It's not nonsense; it's an opinion. You don't like it much? Well, you have different tastes.
I just love the wide open world, the ability to dick around and do whatever the hell you want. I don't care that the main quest is "meh," the game is not about the main quest.