I use them as a tie breaker only. I don't care that much about them, but if there are two awesome games and one has trophies and the other doesn't, trophies is the arbitrary distinction I use to decide between them. Fallout 3 fell behind some other titles for me this season for that very reason.
You can find me on facebook as Markus Van Rijn, if you friend me just mention you're from VGchartz and who you are here.