The Iron Giant is waaaay overrated. The animation is nice and the story is that cliche family friendly mush that is always enjoyable, it's just kind of dumb though. The villain is just completely insane and so stupid it completely breaks my immersion. One, if he has no respect within his organization, how does he hold onto his position as an independent investigator? Two, he's just wildly irrational from almost his first appearance and devolves from there. I don't get why he is so intent on destroying this marvel of machinery at any cost, the better course of action would be to capture it, if possible, and study its technology for use by the American military. This doesn't even cross his mind. Three, he disobeys a direct order from a general (also, why were there no code words needed to launch a nuke?) how did he envision this ending in anything but court martial? It's just silly.
The evidence requirements of the general were really weird. He wants footprints (which this 1000 ton monster is somehow not leaving everywhere) but bites out of tractors and grain silos don't count for anything I guess?
Like, the movie was fine, I didn't hate it. But this is far from the masterpiece everyone seems to claim it is.