Okay, but what good are professional reviews if they are all positive and no one wants to do any that are negative? Not saying anyone should do a negative review for fun or for sport, but reviews don't mean a whole lot if they are all positive.
And I definitely agree with the earlier sentiment about prog reviewers. Prog sites and fans are very protective about the genre, so the biggies of the genre are almost always gonna get reviews that are, at the very least, positive.
In the case of Mike Portnoy, given his personality, I am sure most reviewers know by now that he is the type who would cut you off from any future interviews if you gave him a negative review, and probably advise others close to him to do the same, so they probably feel almost obligated to give anything he does a good review.