It's not a hard game to platinum, but it takes a long time because of all the crap you have to do and because of the glitches. Capturing 55 or so HVTs alive (you get a different ending if you capture them all alive) is troublesome, especially when you get to the later factions that have Fuel-Air RPGs and bigger guns. Some of the side missions are a pain in the ass, plus the 100 spare parts, which makes the unlock all shop items trophy a pain, too.
Also, I should have the platinum for the Ultimate Genesis Collection before the next update. The game is ridiculously easy to get the trophies, although there are a few annoying ones (Columns one was slightly easier than I imagined since you can pause to plan your next move).