Not if there from credible reviewers - again IMO.
tcm
100% agree with you, there are credible reviewers saying things that don't add up, Some fluffing up the report and some just vindictive, purely as an example (and no way debating a review) I scratched my head on a review you recently wrote after seeing a photo of an email, if your review had been the only one about said girl it would have put me off seeing her, but because there is a vast selection of reviews it gives me a little more to go on when making my choice, so I'd definitely say more reviews or better than less.
Another example I'll give, I've reviewed a girl twice, the first time I saw her it was fantastic but the second was a b&s and I wrote a negative as I believed everyone should know the truth, so I've I fact created more reviews as this thread is discussing but IMO it was the right thing to do.
I think the more recent the reviews are also helps as someone that was amazing last year may not be delivering the same service level this year.