My crew of 4 (unfortunately, the other 3 are Gopher fans) have been going every year for well over a decade. I personally really enjoyed Buffalo... we flew into Toronto and then drove down. The Mounties did question what the heck we were doing driving back into Canada to fly back to the United States... which made for a little longer interrogation! But as far as the games and the city, I was pleasantly surprised.
Loved Vegas, Tampa is great, Boston good. I also liked Philly. Chicago sucks. No thanks St. Louis, but I did hear the committee really liked St. Louis so I expect it to be back there again. I concur Nashville said no which I also think is too bad. I'm not a fan of Saint Paul, and it's too close, so when it's here we pick a regional to go to instead.