I can sorta see why kids would like it--because it's Spider-Man and at that age everything with Spider-Man is instantly badass. I liked Batman & Robin as a kid, not because it was a cinematic masterpiece, but because it has Batman and Batman kicks ass. It wasn't until I got a little older and a little wiser that I looked at it and noticed all the dumb shit in it.
It'll be interesting to see what his reaction will be when he gets older, looks deeper at the Spidey-lore, and realize that they basically had the hero Peter Parker sell his soul to the devil so that they could wipe away his marriage.