Both Lego Star Wars games are great fun. The characters are charming, the scenery clearly recognisable from the films (and as lego pieces) and full of fun anims and cut-scenes that will have you chuckling.
I play both games with my 6 year old on the GC and 360 and he plays with his friends and our neighbours' kids. The clever 'collect the studs' system means player never 'die', they just keep regenerating at the loss of some of their studs and since their are so many to collect in the world, younger players can continue playing happily, regardless of their abilities. As a result, these games have brought us hours of fun.
Gripes include occasional bugs, like characters getting stuck on the scenery (or spawning on the edge of a ledge, only to immediately fall to their death over and over), the fact that it's not always immediately obvious what you should be doing on some of the puzzles and the rather nasty greedy streak that sometimes crops up, which has you competing with your young 'uns for the studs!
The GC version of this title is as good as the PC & 360 version - I can see very few differences - just chose your favourite system and get the game to match.

All in all, great entertainment for kids and adults alike.