Yes, but if you are reading the reviews, you will be able to determine if they are useful to you. Many will not be. You should certainly be applying the same critical thinking skills that you used when hearing recommendations from your friends in the first place.

I am assuming that there are useful negative comments, although I haven't seen any yet. (My interpretation was that this was because I was only looking at good doctors to start with). If you have a useful comment on any doctor you have seen, please do add it -- it could save someone some trouble.