Inadequate parking (not enough space and no elevator to top floor). Room didn't even have an armchair. Ice machine stayed broken four days after reporting it. Elevators strange and irregular (to the point that I expected to get stuck at any time). Noisy. Pizza from the pizza place downstairs had a Bisquik crust and was cold and flavorless--including CANNED mushrooms. Maybe there's something better in the "food court," but that's closed for "sewer repairs." Because of construction, it took a half hour to find the parking ramp in the first place. Pro tip: the "Flamingo Hilton" is a different hotel--one that actually has checkin-parking in front--unlike the Flamingo.
By accurate measurement, it was 0.4 mile walking from the parking ramp to my room.
I've stayed at Caesar's Palace and it really IS a palace compared to the Flamingo.
Final indignity: took a half hour to CHECK OUT. The 700 year old clerk (who was on oxygen, probably so customers would feel sorry for her and not spring on her like a panther when she says something sarcastic) told me "you could review your bill and check out on the room TV." Well, not if I wanted a receipt. Also, the "express checkout kiosk" suckered me out of line and didn't work, and ten more people were in line ahead of me when I returned.
Second pro tip: ALWAYS do valet parking. There's no charge--just a tip. It's worth five bucks to not walk through the 110 degree (no, that isn't a typo) ramp. I've stayed at four places on the strip and the Flamingo is the worst so far.
Oh yeah, I almost forgot: they want $14/day PER DEVICE for wireless Internet. Balls. Lucky they don't have a quarter-a-sheet paper dispenser in the bathroom.