Superman is aimed more towards a mature audience, but that doesn't mean kids can't enjoy it. Action Comics is more accessible for the kiddies. If Marvel Adventures comics don't do the trick, maybe give JLofA a shot. The Meltzer written issues are a lot wordy and not a lot action, but the current arc isn't too bad. Though I must warn you, Hawkgirl and Red Arrow are starting a "relationship". All Star Supes might be good fun for a kid, AS Batman is crap. Possibly Invincible?
