In our thirty-something visits, mostly to OKW, we've had few problems. Once the housekeeping was sloppily done - rings on the table, fingerprints in all the windows and TV. This was not corrected without repeated calls to housekeeping. Very annoying, but not a show-stopper.
The second problem was a totally trashed 1-br. Not just dirty, but trashed. Broken blinds, hot tub full of permanent marker, light bulbs broken out of their sockets, wet floors, etc. That was a shock! (Must've been a heck of a party!) Turns out the room was supposed to be out of service due to the damage, but got assigned by mistake. We were moved immediately.
Other than the occasional burned out bulb or missing kitchen items, those are the only problems we've had, and we're very satisfied.