Too many reviews is less of a problem than too few IMO.
A single or even a handful do not give a breath of feedback that enable you to make a sufficiently calculated call to see a girl.
Every punter has their idea of what is good, great and shit. I certainly wouldn't expect anyone to see a girl purely on my recommendation, unless they knew they had similar taste and MO to me. Likewise I tend to look at who is reviewing rather than just what is written.
As long as the review is factual, then I don't think you can have too many, and the inevitable fall from grace needs to be spotted as soon as possible.
For example Smiley Miley continues to give a roller coast ride that is either great or crap depending on the day of the week. Yet she will still have a queue of guys wanting to see her, happy to take the risk in the hope that they will be the lucky one.
Risk versus reward comes in to play here.
Expectation to me is the mother of all fuck ups, and you really need to go into a punt with as few preconceptions as possible. This is indeed very hard with a highly reviewed "darling", but some girls fall into the "guarantee of a great punt" category and in most cases if not all so far, I've found deservedly so.
It's your money you take your choices.