I don't really trust any anymore. I use GT as they use video so if they are moaning about something, they can show me why they are moaning about it, it is also because I can be a bit lazy, and I can't be bothered to read IGNs longer reviews.
Generally I decide what games I am going to get before the reviews come, unless they get awful reviews. I also take notice of them when games I haven't heard much of get great reviews







