CK's death was a good story, and pretty much the only one he ever appeared in where he made a difference. Runner up might have been his part in Superboy 211 to stop Element Lad from killing Roxxas, but that was really E-Lad's story.
The problem with his death story was, as I mentioned earlier in the thread, that it was inked by Jack Abel, who made James Sherman's art pretty unrecognizable--for the worse.