The first Lego Star Wars was a fairly good game but it was too childish, this game is no different. With a few improvements from the first one it is still the same basic game all together. The few improvements include more space fighting levels, longer levels, and more characters. There is a whole new batch of characters plus if you have a memory card with a file from the origional game you can get all of the character from Episodes 1, 2, and 3.
I would say rent it first unless you are a big fan of Star Wars or Lego or you are fairly young.