> A legitimate review, is a legitimate review.
To filter for legitimate reviews, real identity can be important. That turned out to be what set facebook apart. People transacted online as themselves, and they incorporated real life experiences into their profiles. Reviews that were verified to be by a person, with a verifiable identity, track record, and reputation can raise the signal to noise. If you simply need a valid email address, anyone can make as many reviews as they want with no stakes, which in turn, devalues everyones ratings in general.
If I read a review from Joe Bob, I don't know Joe Bob and I don't really care who he is. The fact that I can see his real name makes absolutely no difference to me as a user. All I care about is what he said. To me, his real name is no more different than if he was Joe B. or J. Bob or redneck69.