I think La Mer misunderstood your question ['where could I get these ratings'?]. You won't get 'ratings' from any of those sites.

A good class guide is prize money contested [in most cases]. A horse that has won a $40k race is useually a better horse than one who's best effort is a $20k race etc. For the average punter who doesn't realize that a horse winning a C3 dosn't nessasarily mean that it is a classer horse than one that has only won a C1, as that would depend on where those races where won. Recent race prizemoney contested and won [in a race I mean, not a horses whole carreer] is always a pretty good class guide. Class ratings in Aust. are a massive road accident. 'Average earnings' arn't a bad class guide either.