Tbone has COD: Black Ops platinum also.
I would agree World at War single player on veteran was definitely harder, but the zombie mode certainly prevented this one from being easy. It probably took me a good 20 hours of playing zombie mode to get those trophies. It sucks that the trophies are required from the box where pick ups are so random. Then after spending 5000 points trying to get the weapon... you'll need another 5000 points to upgrade it. And you probably want to be safe and spend another 2500 points on Jug Nog so you can take more than 1-2 quick hits. Oh and you might need to spend another 3000 points to open all the rooms if the box isn't there. Or if you get it too soon you'll need at least one more good weapon from the box to stay alive and rack up more points. So there's another 950 point gamble. Or go with the MP4 or 2nd shotgun from the wall. Finally get it too late and the zombies will survive a single crossbow shot.
Ahhh you can tell I had fun with that one. I was one of the more rewarding feelings I've had from a trophy when I finally got it though.
On ps3trophies.org the average difficulty it almost equal between a 7 and an 8.
http://www.ps3trophies.org/forum/call-duty-black-ops/77834-platinum-difficulty-rating.html
