It's says little because it doesn't go into what a game did right to get those sales, but it's more than "sales are not an indicator of quality" which says nothing at all. Sales also aren't an indicator of a lack of quality. It's like when people bring up popularity, and the common response is "just because people like it, doesn't mean it's good", which is an equally useless claim. While popularity doesn't mean something is good, it also doesn't mean it's bad, so what are we supposed to get from statements like these? Such statements are meant as a dismissal. "Popularity/sales aren't an indication of quality, therefore popularity/sales are irrelevant." It's the equivalent of saying "Yeah, so? That doesn't mean anything", but of course it does mean something, it means the product is doing something right/wrong.
If one defines quality as "a product with high sales", then obviously the statement "sales are not an indicator of quality" is incorrect.
If one is willing to dismiss sales and popularity, why would critical acclaim be any different? Obviously it's not, given how common it is for people to accuse reviewers of being bribed, victims of hype, or just plain lying.
I like this. Not just the PC helping the leader make decisions though, but the PCs actions determining what kind of person the leader becomes.