Among my favorite letdowns is a hotel selling its rooms for the same/inflated prices (e.g. during a event) even while construction is taking place inside/next door.

Also, on a recent trip to Egypt, the manager at a 3 star (according to Egyptian standards) hotel mentioned that wi-fi wasn't necessary to have in guest rooms because "we're simply a 3 star hotel..." though, I only brought it up because some OTAs mentioned that wifi was also offered in rooms.