Tomb Raider PS3 is a very good game, I really enjoyed the experience and the effects they created within the game.
My only disappointments for this game are the Multiplayer trophies and I found the online play to be uninspiring. I would have also had liked to received a trophy for beating each difficulty within the single player campain, this would have inspired people to play through the Hard difficulty not only for the challenge but for the worth while trophy for the finishing it at the end. I did complete it on the Hard difficulty myself and enjoyed the challenge.
So in summary I would have gone for the Platinum Trophy if I found it to be a more achieveable and enjoyable online experience. But if your keen to play a great single player experience and just skip out on the online, as Tomb Raider has a really great single player experience to play through.