When I was playing Infamous on the PS3 I become obsessed with getting all of the trophies. I got to experience everything in the game but I also felt exhausted. To this day I can't play an Infamous game. =S

Anyway, I think the trophy/achievement thing is a neat little part of a game, but it shouldn't be the be all end all. It's too easy to become obsessed with them.

Like how IVs and Evs and natures kinda took some fun out of Pokemon for me.