In a recent GFaqs poll, the age of the users was asked. Most people on this site can't even drive yet so it's important for them to be told by adults which games are good. Otherwise, how will they return a game if an adult won't drive them?
I use a combination of both. I will bear the review in mind but usually go with my gut feeling and usually it turns out to be right. Usually the only reviews I disagree with are bad reviews, most positive reviews I tend to agree with.
Difference in optinion is not an attack, merely an opening to discuss different perspectives and views. Play a game then judge, don't judge before you play.