For the fans
The worst part is the puzzle mini games. They kind of suck. They are basic mini games that you have probably seen in many other games. On the hardest difficulty they are just frustrating. Especially in certain parts where you have a time limit. There are other parts of the game that are unfortunately trial and error, where you won't know what the hell to do until you die 5 times or so. The story doesn't seem as deep as the Devs were promising ("Interactive episode"). But great voice acting and performance from the real cast.
Overall it's just fun. It's not that often you get to run around as the Doctor and hack into things with your sonic screwdriver. For the type of game that it is, typical PSN side scrolling adventure, it's a good game. At $20, most would probably await a price drop, but fans like myself will really get a kick out of it.