See, even saying that Hurwitz isn't usually positive is a stereotype. It's not true. I don't read that website regularly, but it is one of the ones I usually search if I'm curious about something and want to see what reviews are out there. He is perfectly capable of giving out 9s and 10s when he thinks they are warranted, and in any case a "critic" who gives out nothing but 9s and 10s simply isn't being critical enough.
Not everything can be the best of the best... and similarly not every composer can be the best of the best. That is completely different from saying a composer isn't enjoyable, and that particular review actually makes that distinction pretty explicitly. But if one is trying to distinguish what is good from what is outstanding, as a critic must to be any use, not everyone gets a prize.