I got the Terminator Salvation platinum trophy a few months ago. I also have the Call of Duty MW2 and MW3 platinum trophies. Today I got the last DLC* trophy for MW3 so I now have all MW3 trophies (including DLC trophies).
I was quite skeptical that I was gonna be able to pull this one off. Stealth isn't really my kinda play-style. But this one wasn't too bad. My first play-through, I TRIED being sneaky in order to prepare myself for the next play-through. But when that didn't work for me it was run-and-gun time. My second play-through I watched some vids to help me out when I was stuck. Red Dragon has some amazing video walk-throughs. You can have just about every mission done in under ten minutes if you watch his stuff. Everything after that is clean up as long as you've gotten the side missions and collectibles. And this is one game you absolutely want to have multiple save files for in order to manage them later on.