Michelin and AAA/CAA are probably two of the best known ‘raters’ of lodgings and restaurants. (Okay, they are the only two I know of.)
Let me clarify one thing first:
Michelin uses stars for their rating (one to three - I could be wrong).
AAA/CAA uses diamonds for their rating (one to five).
Most places that are rated by either of the two comapnies will also advertise the name (“AAA three diamond hotel”), since these companies have stringent standards, including convenience (e.g., on-street vs. off-street parking, while valet parking gets a hotel more points towards a higher rating), amenities (spa, gym, in-room coffee makers, etc.), and of course, cleanliness and service. IIRC, AAA will not even consider a rating a lodging unless it has basic safety features in place - door peep-holes and window locks.
Restaurants are also held to a higher standard as the number of AAA diamonds rise - general ambiance, as well as noticable touches such as tablecloth quality, meal presentation, not forgetting the quality of food and service.
In general, I would be leary of anything without some sort of known name and parameters attached to the rating. (“We’re a 5 star hotel!” - but they don’t tell you that 20 is a top-rating.)
Even less precise are hotel room names - standard, quality, superior, deluxe - here again, one needs a definition to accurately judge - one hotel’s “standard” room (bed, chair, table, shower - minimal furniture and amenities) may be another hotel’s “deluxe” room, both of which overlook the parking lot and trash compactor. Even a listing as “ocean-view” can be deceiving - you may be able to see the ocean, you may have to cross an eight-lane highway and hike the boardwalk to get there.