I noticed a similar effect on my opinion about movies and books. I am extremely influenced by what I hear, to the point that a movie that I love when I see it for the first time is completely spoilt the second time if I heard a disparaging comment by someone I respect. The same thing almost made me stop listening to music. I've heard so many bad things about Houellebecq that I know there is no point in even trying to read his books.

This sounds like I can be easily influenced, but it may also be that I am more conscious of these effects because I find it very important to judge things by myself.