I disagree. I thought Conner's end was poignantly written and heroic, especially in light of the fact that Geoff Johns did everything he could to make the character likeable.
I don't think that he was necessarily written poorly in this issue, just that the character was pretty poor already, and that this didn't improve things much.
Geoff Johns does this: make characters likeable and then kill them off shortly after.
And you're enthusiastic about him working on Superman?