Its easy to project on a blank slate.
The most "human" thing he does in that movie, the bathtub thing, was fucking creepy. It wasn't something out of character for the robot kid in AI.
Nobody in the movie is actually relatable or enviable. I think that's why most people dislike it so much, you don't want to be that Superman or Batman but you don't feel like you relate to them either. People by contrast will overlookthe flaws of something like Captain America because you want to be Steve, or overlook the flaws of the first Superman movie because you want to be the Jimmy Olsen to that Clark Kent.