I understand the point about star ratings too early. But to be honest every website benefits from having an entertainment factor and the kids and their parents do enjoy that feature of the site. I dont think it does any harm because nearly all of the younger kids / parents are only interested in the USTA rankings and the star rating is an interesting feature for them. No danger of it affecting their game in any way. At that age they are dreaming of the pro tour not planning or college. No reason that they shouldnt enjoy the site though.
Would be interested on TR's position on doubles !