A good reviewer has to point out areas of interest/concern so that prospective buyer can have an ear out for such matters. That means trying to put into words qualities that are not easily described and it might mean exaggerating a bit so that the reader understands what is being described. This might distort overall perspective. By hearing a vast array of different speakers under differing conditions, a reviewer does develop skill in identifying a lot more subtle differences and areas of concern, and these should be part of a good review.
If you have the privilege of hearing a speaker in your own home, you can try to listen critically for the same things mentioned by the reviewer or you can just listen and judge for yourself. The best judgment, to me, is how much enjoyment you get from the listening session and whether the speaker plays well with all sorts of music. Listening for particular weaknesses and the minutia might help you determine what could be a source of future irritation once you own the speaker, so it doesn't hurt to do some critical listening. But, it is the overall simple enjoyment and ability of the music to hold your attention that matters most. For me, the biggest difference between different sets of otherwise decent sounding speakers is that ability to keep my attention and involvement in the music; too many speakers sound boring after a short time.