Marriott is terrible for posting stays and/or the correct amount of points, and should never be mentioned in comparison with any other hotel chain, except to say "at least it's not as bad as Marriott".

IHG does seem to have fixed problems that had it down there with Marriott. (consecutive stays on points, then cash for example). Hilton is probably the best of the bunch.

Hyatt, to be fair to the OP:

1. the vast majority of stays post correctly and quickly
2. new hotels are much more likely to have issues than long-time Hyatts
3. when the stays don't post, Hyatt CS does seem to struggle more than other chains. From what I understand from my own marathons to retro-credit some all-inclusive stays, this is because relatively few back office people at Hyatt are able to override the system and issue points / stay credits when the hotel can't or won't issue the credits properly.