Chrome said: "For example one of my systems uses ratings very successfully".

I covered that Chrome in my last post. They are great for systems as can be pp odds, Newspaper tipsters selection and lots of other available pointers etc. But ratings by themselves as a source of punting selections to bet on [and they can be good use for throwing into exotics as Wunfluova mentioned] would send a rich man broke. Regardless of how good their source. Thee are just too many paradigms involved in a horse race for ratings to replace reasoning.

PS:
Zoe [the handbrake] just piped up, 'all men should be rated long before the starting gates open' :-))