i haven't used any of the guides yet, and i've got most of the trophies. it's a very easy game. maybe i should have stuck it on hard or very hard :S
some trophy locations though is what im using the guide for. i don't have the time to look in EVERY location, so for the last few trophies, i'll be using a bit of the guides.
yeah , who has time to walk around the wasteland when killzone 2 so close …. guide was good to find bobbleheads , schematics and behemoths… i think they should have made Explorer perk available from a low level , not only from level 20 (by that time you're almost finished…)