I am a huge fan of the PW series, and the start of the series fails to disappoint. There is 5 cases, which might not sound like a lot, but many of them include unexpected twists which mean they can last up to a good week, depending on how long you play them in a day. There is never a boring point in the game, each moment is interesting and humourous at the same time. The characters are brilliant to the game and it's easy to get used to them.
One thing people may see as a negative is it's high reading content, but this is the type of game it is. You will need to not mind reading in order to enjoy this game. Case 5, which is a case that has been added especially for the DS version of PW, has some touch screen abilities which are interesting, fun and different.
In conclusion, if you dont mind a reading based game, and love a game that is full of twists and suspense, this is definatley the game for you!