Valkyria chronicles is one of my favorite games on the PS3. I really enjoyed the game play and art style of the game. Spent a lot of time farming the plans to make the rare weapons and trying to get max rank on the missions. The game has a lot to it. I wish they would make a console sequel to it, but they did a good job with the psp game they released over here in America.
Already played both Mass Effect 1 and 2 on PC. Have yet to get 3 but I'll eventually get it on PC. Lords of shadow is a game I've really wanted to get especially for the art which I find gorgeous.
It's a tough choice, I'd really like to get them all but time constraint aswell as money prevent me from doing so. Deciding factor will most likely end up being which one has the best single player, story and characters.