I mean sure game reviews have always been a little suspect going back to the 80s when game companies themselves owned the magazines that released them but even then they were not completely useless. And I remember the glowing reviews Ultima IX got LOL. So, you know, pinch of salt.
These days are a few I know well and thus I am aware of their biases and my opinion is likely to coincide with theirs. I cannot possibly know the users well enough to know what theirs are so I generally find it not very valuable to look at user reviews...unless the game has serious issues. Generally there is no reviewer or user I am going to take as authoritative, but I do think it is useful to get a little taste of what other people are thinking.