It has psp graphics and it seems like a pretty worthless game lol
Good graphics don't necessarily make a good game. For the genre (Action Puzzler), the graphics work well. I'd describe it as 2D with 3D elements. It is more or less a side scrolling platformer, but the puzzles are what make the game, in my opinion. The only real strike against it is that the puzzles get to be a little repetitive.
The game is basically a 'must have' for fans of Doctor Who (it is, in my opinion, one of the best DW games to date). If you are not a fan of the show (or puzzle-based games in general), then this game is probably not for you.
For those of you, like me, who were frustrated by the puzzles on the PS3 version where you were limited timewise because of enemies bearing down on your position, the touchscreen makes those puzzles much more bearable, while not making them overly easy, either.
Puzzle-Hard is now 'Hard' instead of 'Darn Near Impossible'. Of course, there are still some puzzles where DS3 controls would make more sense, but that's why you have the Cloud Save option (which is separate from the PS+ cloud save system).
Not sure how playing some portions on the PS3 while playing others on the Vita will affect trophies, because it is two separate trophy lists (yes, that means two separate Platinum trophies). I currently have 58% on PS3 and 17% on Vita.