Yup, the trophies were deceivingly difficult. The platinum will take 7-8 play throughs, and because of the requirements of some (guns, ipod songs), you will end up getting all emblems anyways. So a Big Boss play-through and getting all the emblems is pretty much forced.
Excellent. I like platinums that separate the boys from the geeks.
Once again, if you haven't played MGS 1, 2 & 3; be sure to do so first. The gameplay is great, but you miss a lot of epic story by not doing so.