I tend to just play a few hours, see a few trophies pop up and then if I'm really enjoying the game, I'll look what the rest involve. Most games, I wouldn't even attempt it. I have 2 platinums. Sleeping dogs and saints row 3 so yeah similar games. I could easily get the platinum for Infamous 2 but it would involve playing the whole game again as I didn't do all the quick saving/loading needed to choose both options in various missions but I doubt I'll ever bother.