I don't agree with that AT ALL and I will tell you why and its a simple concept. Many people join online forums to ONLY get info on a problem. Those posts are NOT giving you a good cross section of all of the people who own that car just the ones who have problems.I recently had some brake work done at my Mazda dealer, which has a Maserati/AR dealership right beside it. The Stelvio definitely looks better than the CX-5 IMO, and I think part of it has to do with the painted cladding around the wheel arches. RDX's reliability ratings may be overblown due to common first MY issues.
IMO the best way to suss out reliability or quality concerns is to find an online social community or two made up of owners/potential owners (like an online forum or a FB group). That way, you can potentially get real world feedback from owners while also considering the info provided from other publications/reviewers.