Find a large enough group of people, and there will be some who are unhappy no matter what. Hilary Mitchell combed through TripAdvisor reviews of tourist attractions in Scotland and found some that are just sad. If you go to a place named War Museum and complain that it's too militaristic, you probably won't find anything else on your trip enjoyable.
You get the feeling they are expecting nonstop entertainment. These folks should have gone to Disneyland instead. But if they did, they'd probably complain about the prices. See 19 of these reviews of Scottish attractions at Buzzfeed. -via Metafilter