I would say Benny G, Rance, and Edwards have improved since Hardwick was appointed. But that's about it. Everyone else has either stagnated or actually have gotten worse.
Vlastuin hasn't improved much from year one (although the HB general is a hard position to master), Cotchin had that 2012 year we all speak of but maybe that has more to do with him finally getting his body right as opposed to great coaching.
Milo seems to be having '2nd year' blues.
But the most unforgivable acts for me is how he's handled Riewoldt, and Tuck. It's been talked about at lengths before so I won't elaborate further.
But back to Vickery, I think we have to accept this guy is the Colin Sylvia of our team and unless we get Dr. Phil or somebody to make him give a poo about crashing the packs and working hard for his team mates he will always be the forward which will expect it to be kicked over his head so he can run onto the ball uncontested.