I got it, but then I've played all the games. Multiple times. The game endings are all pretty much WTF (especially the UFO and Dog endings, those are awesome). Actually, if they really wanted to be true to the games, they ought to have filmed like 4 alternate endings...

Anyway, I'll heartily agree that the people in the movie were far stupider than they needed to be -- The actors were good, but the script made them stupid. One can forgive that in a game, but in a movie it really makes you go, "WTF?". Oh well, yay special effects, good special effects are all it really takes to endear a movie to me, because I am shallow. XD