I just saw it. Wasn't that bad. Wasn't that good. Shia LaBoof is pretty terrible. (aside: I met him in real life and he was nice). Those alien shenanigans were dumb. I was half expecting ET to arrive. I liked the car chase in the jungle, except for the George of the Jungle Shiananigans.
Harrison Ford was too squinty and crabby. The acting in general was awful. I think too much happened so that there wasn't really much tension and the stuff that was supposed to be funny just came out corny. I thought the ants were actually pretty good, and in general I think they really did use restraint with the cgi (except for the praire dogs). That a-bomb thing was pretty fucked up, I thought. I think it was supposed to be funny but it was disturbing. A lot of the movie definitely did look really sound stage-y. It's weird, it probably cost a bazillion dollars, but sorta looked retro and cheap. I guess that's the point. The camera filters were weird too. Still, all in all, I didn't totally hate it. It's silliness! Enjoy the silly! Even if it's kinda stilted and flawed.
Those callers were right about the "weight" of the skull, though. It's so obviously plastic and seems to weigh like 2 pounds.
This is better than the movie, and more intriguing:
http://www.crystalinks.com/medmusiccs.html