I've only played this game for an hour so far so I can't give it a full review, but the 5 stars are for the bits I've done. The laughs come thick and fast, it is so clever how Lego manage to get so much humour into the little characters. The cut scenes are brilliant and there are some great Star Wars references in there too. As for the game itself, it's very similar to Lego Star Wars in playabilty and controls, but at first glance I would say that it is a bit more challenging, with a lot more puzzle solving right from the start. Having said that, with the Lego makers, you're never totally and utterly stuck, (not yet anyway). The graphics are excellent too, although sometimes the action can be a bit on the small side, but that's what you'd expect on a PSP screen. Apart from that I can't fault it.
So, if you liked Lego Star Wars, and you like Indiana Jones, then this is an absolute must-buy.