Of all the time I have spent in the app store, I have not found such a way. However, highest grossing typically have higher rating than those below them. Top paid and free aren't reliable for this at all though.
There may be a rating sorter app somewhere?
EDIT: Rating is not reliable. Some people think that one star is 5 stars and vice versa. I don't know why. (Mabye it's because the stars are red?)
It is unreliable in some instances but should give you a fairly good idea. It just seems it's been overlooked as a search option. I mean what's the point in rating the games if it means nothing really. Seems a bit silly to me. Thanks for your help mate.