Toby McQuire makes Spiderman happen. Plus it is light in delivery and the audience can sit back and watch it in essence over and over again like reading a comic book.
Batman, in my view, is too heavy for a youthful audience. But Batman has no super powers, everything he does he has to create from science and/or mechanics.
I skipped the Wedding Crashers and popped in to see The Bad News Bears. Much better movie, in my view; if you want an hour of laughter. Plus, in part, sends a good message to the kids. You catch the American Flag waving in the end.
And Spiderman is very true to its source, which has always had a pretty broadbased appeal. The superhero with everyman problems is highly approachable.
Batman is way too heavy for broad appeal, at least if he's done true to the source. Which is fine, broad appeal shouldn't be considered the be all and end all of stuff. There are different demographics in the world and they can be served by different entertainment.
I'll probably rent Bad News Bears, I'm just not sure I'm read to accept someone other than Mathau.