It isn't a BAD article, but it doesn't say very much which hasn't already been said.
One point on which I disagree:
Gaiman writes: "Other heroes are really only pretending: Peter Parker plays Spider-Man; Bruce Wayne plays Batman. For Superman, it’s mild-mannered reporter Clark Kent that’s the disguise – the thing he aspires to, the thing he can never be."
He's not quite right there. For Batman, Bruce Wayne, is a disguise he must wear during the day.
*I* think Superman Returns looks like it is going to suck pretty badly. I'd be pleased to be wrong. But...look at the advace photos like the one of the left. There's something very wrong with them.
Anyway- you can read the article here.