Got a chance to spend some time playing today, and I would say this is the weakest of the Lego series. Can't invert the y axis(or is it the x), so flying, at least for me was cumbersome. You also seem to be fighting the camera all the time.
Gotham city is big, almost too big, and the game can seem to be a confusing mess at times. The on screen map bar is little help, and it is extremely cumbersome to pull up the full map. It is cool to play as Superman, and at least one console required Flash, so looking forward to unlocking him.
Biggest disappointment was doing part of the story line, and the game locks up on the final cut scene. Tried it three times, and all three times, the game locked up. It's the episode where you are fighting the Joker robot at city hall. I'm sure there will be a patch, but it sucks as Superman is weakened, and I would imagine he doesn't regain his strength until you finish the story.
I'm not extremely disappointed that I bought it, but had hoped it was as good as Indiana Jones.