providers that ONLY have good reviews by guys with multiple reviews.
I don't always buy the "I am having a bad day excuse".
There is something called YMMV, but why take the risk?
Stay away from the newbie providers too. Two newbies together is also too risky.
You will have plenty of time to experiment in the hobby. Your first one should be a provider with a squeaky clean resume. Choose wisely.

In that case, I would not worry.  Even the best providers can't please everybody.

On the other hand, if she has only two good and two bad; that's a problem.

You might do two things:

First, ask on your local board about her.

Second, assuming you have VIP membership (And if you don't you should get it.)  PM some of the people who have seen her and ask what the deal is.

Also, (Again this requires VIP) click on the review history of the various reviewers.  The ones that have written the most reviews will be the most credible.  The ones with one or only a few reviews, less so.

send a PM to a few of the reviewers to get their private take.  Sometimes a guy will admit that he just didn't feel the "chemistry" during the date and may have written tainted information.

You need VIP to read the reviews (details) as well as send/receive a PM.

Take a look at the other reviews that were written by the same guys that gave a negative review.  If they only have the one review then I wouldn't give it any thought.

Also, look at what they said.  I've seen some reviews where the guy gave a negative review because certain things were not on the menu and in the girl's profile she specifically says that she doesn't like those things.