Brand is mainly about bedding, towels, lobby scent and customer survey scores.
Those are about the only things from which we can expect consistency across the hotel properties but IMO the expectations from Marriott-branded timeshares are much more extensive.
I don’t check online reviews for Marriott timeshares because I know what to expect - well-kept units with well-stocked kitchens including decent cookware and good quality dishware, decent furniture that’s not being kept beyond reasonable usefulness or design, decent artwork and floor plans, higher-quality linens compared to midrange timeshare companies, full staffing with pleasant employees, a daily Activities Schedule with multiple free and paid options for all ages, etc. (I only wish for better knives and to not be hounded by too-pushy sales personnel, which luckily hasn’t been our experience across the majority of all our stays.)
IOW I expect a total experience that requires healthy realistic budgets and cooperative resort boards, balancing the standards expected by Marriott to be fulfilled and the Owners’ pocketbooks. Neither of those considerations appear to have been top of mind for this particular resort’s board. And realize, this is a Grand Residence, not a lower tier Vacation Club, so my expectations of the brand standards might be the least rather than the most!