So far, it sucks. It seems the DS version really got the axe here. Apparently, the only story levels are from Crystal Skull. There are minigames you have to unlock based on the other movie sequences, but they are just that- minigames. For instance, the ship level at the beginning of Last Crusade is just a stud collectathon. The studs randomly wash onto the boat, and you must just run around and collect as many as possible to beat the minigame. It's not even as fun as THAT sounds. >_> There's another one where Indy is inside the temple with the giant rock, and you are on top of the rock. You have to use the touchscreen as a track ball to navigate around to smash pillars. It's actually horrid, because the controls are terrible.
The actual game, you are just in this jungle hub level. I'm not sure where the hub ends and the levels begin. I don't want to play farther to find out though. The only Lego DS game I've liked so far based on these movies is Lego Star Wars Complete Saga. And that had one level for every episode cut out, which sucked (just up the cartridge size you stingy bastards) and the cinemas were just cardboard cutouts.
So yeah, pass this game, it stinks IMO.