Bad:
New Orleans. Few years post-Katrina. Very obviously still a social divide and thought 'the jazz strip' was tacky
Morocca, specifically Marrakech. Preferred it down the coast in Essaouira, thought Marrakech had an edgy (in a bad way) vibe like something was going to kick off and you're trapped in all those lanes being hassled.
Dominican Republic. Been to a lot of Caribbean islands and didn't like this one.
Sicily. Thought it would be like the getting Amalfi coast type food and culture. Really not. Bullet holes round the walls in banks in Palermo - crazy! Also thought Pompeii was over-rated,
Ko phi phi (min Thailand (where they filmed the beach). Went 20 ago and it was a rubbish dump of plastic then. Stayed for less than 48.
Raffles in Singapore. Well tacky bar where tourists eat peanuts and drop all the outers on the floor.
Second the Mona Lisa being average
Also the Sistine Chapel is kinda a let down due to way they manage the crowds and it's 'just round the corner', 2 hrs later....
Good:
Costa Rica. All of it, just amazing
Loas. Brilliant and very french so eating crusty baguettes with spicy food in south east Asia was a treat.
Driving Pacific highway 1 in California. Awesome scenery, food. Loved it.
Highlands in Scotland via the Sleeper Train and waking up to see stags. Fabulous
India (parts). 24 hr train rides just a crazy adventure!
Japan. Just give me all the food. No thanks to getting squashed in the tube but bullet trains are cool (I like trains :))
Been lucky to travel a lot. Would also add many parts of the UK.