I think Carmelo did an OK job being the position he was in. Can he get in better shape in just a week to play a heavy load of minutes? Something I noticed: Can't was not worried about Melo on the offensive end at all. When he started the offense, after he made the first pass, his defender would actually leave him to double the guy he passed to.
I am in the same boat as the OP- I think Harney looked the best at point in his limited time. Start Krezter/Gilliam/whoever in his spot at the 3, IMO.