Just my general impressions thus far:
I don't think CCG is the answer and I'm not a fan of his personal sales style, which largely comes across as try-hard to me.
Still, his energy and positivity are sincere and refreshing. He has to make some silly spins ("biggest transition ever!"; Temple-as-powerhouse; etc) but I think players respond well to the general trajectory of it: we're down but not out, we've got some good stuff around the corner, sort of thing. So while I think he's grating in some respects, I do like the glass-half-full outlook and hope it pays off with recruits.
Offensively - meh. As predicted, CPJ haters are not terribly principled when it comes to criticizing offensive styles and in-game coaching. We're not good and I don't think anyone should have ever believed we'd stay at the same level, much less improve, with DP. We were good-to-elite with CPJ on offense nearly every year; that's rarefied air and it's not reasonable to make that the benchmark. This is where the TO-opponents run into some real problems. Did they think "opening up" the offense was just bound to result (eventually, if not immediately), in performance better than 2009 or 2014, where we were #2 and ti#3 in OFEI respectively? It's unlikely to ever happen. Any belief to the contrary was based purely on hypothetical chalkboard presuppositions, made mostly from positions of relative ignorance about any offensive/defensive schemes and largely motivated by aesthetic preferences.
But we don't need to maintain the offensive performance to match or exceed Johnson's overall success. If the defense trends upward, as I suspect it will, a mediocre offense can be enough. Maybe DP can get us that or slightly more. Like with CGC, I'm not personally convinced that he'll be able to - but maybe. I'm willing to cut him some slack this year due to injuries. As I think ibeeballin has shown well, he's not a moron on the chalkboard. Very few D1 guys are though; the real job of coaching is teaching your guys how to do what you want them to do. We will see.