I never said they'd give a one star review. Obviously, that defeats their purpose. An occasional 4-star review with a minor criticism that most people would read and feel the reviewer was being too harsh about maybe, but I meant that they would give 5-star reviews, but try to appear as though they were just "Joe or Sally Lunchpack" by maybe misspelling a word or saying something like "get a new logo" as the biggest form of criticism. Meld these in with other canned 5-star reviews and it suddenly appears that an app is extremely popular and that not all app reviews are coming from family and friends because, heck one of them didn't like the background color or the logo or something else most people could care less about.
I, in no way, meant to suggest that a PR firm would give bad reviews, I simply meant imperfect reviews would appear more realistic. Sadly, I'm sure that's already happening which is why I (and countless others) hold off before making a purchase more often than not. I'd rather read what people here have to say, as well as talk to friends, read professional reviews, etc before taking the plunge on something I'm not already determined to buy.
A try-before-you-buy model would eliminate this cynicism and caution by allowing us, as consumers, to try to product and make an honest evaluation before choosing to plunk down our hard-earned money or pass.