Amsterdam. Didn't really see the appeal other than certain Dutch girls on bicycles. I thought the tree-lined canal were just filthy and cramped, not full of charm as some people like to claim. In terms of artistry and presentation, the city is quite a bit below the sophistication and grandeur of cities like Paris, London, Madrid and Rome. Don't even get me started on the food, which are mostly generic and bland. On top of all that, the weather tends to be overcast most of the time.
Don't get me wrong, I had some of the best times in my life when I was still college, and visited Amsterdam during the summers. I still love Koninginnedag but really that kind of experience I could have on your random weekend frat party.