Yes, it common knowledge that the Team Ratings are inaccurate and useless, and the Matchup Ratings are way better to look at.
The match-up ratings are not so useful, either. You can see if you were jobbed in the game, but that's about it. It gives you no idea why (except: my SG took all the shots, but he was a crap option). I do not subscribe to the belief that the team ratings are useless, but it is an easy way out if you do not want to discuss the issue. There is no other way to analyze matches unless you know the skills of all the players.
A few months ago I made this thread exactly about this problem, I changed my mind now. Maybe you can have a read there, there are some great responses of BBs in there (112356.1).
You will see that I replied quite frequently there, trying to get a better understanding of the situation. I would be interested to know what changed your mind, since there is no possible way to discuss the results from matches.
Run of the Mill Canadian Manager