Baaaaa....Baaaa.....
Sure, there are a few aspects of the MR program that I feel need to be fixed. I feel very strongly about that. I've written about that at length on multiple occasions in other threads.
But the fact of the matter IMHO is that when the rubber meets the road, by and large I've encountered only minimal difficulty in using rewards wherever/whenever I want (mostly at cat 7s).
Just as important, if not more so, is the fact that IME, Marriott branded hotels usually blow the doors their competitors.