Apparently Sam Worthington agrees with me.
"Some of the criticism, though, Sam simply gets. And he agrees with you on it. 'I can nitpick with the best of them, man, and go down the list on IMDB where they found holes in it and go, 'You are fucking right! If there was a big 10 ton robot coming outside that gas station, surely we would fuckin' hear it!' And I missed that! So now I'm going to be a bit fuckin' better when I'm going through my scripts because now I feel like an idiot for not turning to McG [and saying something].'"
Except you(still) and Sam don't get that the huge robot was DROPPED off by a silent run airtransport. That on screen the moment you sense something is up, like the gas station rafters shaking, the robot is there.
Sorry you still can't grasp that. Sam I can excuse cause I doubt he's been on msg boards where it's been explained numerous times.