His general view is that Superman was written as too powerful; that he can't be seen as very heroic because he's not really risking himself in most situations.
I'd agree this is a bit of a downside to Superman.
It's for that reason that one of my very favourite moments in LNC is in UltraWoman, where Clark tackles the muggers in the alley.
He goes rushing in by reflex, not even thinking that this time things are different, and is almost immediately cut with the knife. You can see him pause, re-evaluate, the dawning realistion that this time he's not invulnerable, he can be hurt...
...and then -
knowing that - he just goes steaming back in for another go. You gotta love him for that. <G>
LabRat