The concert and the first promo with Punk, I agree. I think he's improved a lot since then, the week before and after the Rumble I thought he was fantastic.
Comedy has been part of Rock's Schlick since like, 2001. I think he's managed to bring the intensity he was lacking last year back though. I don't have much hope for the Cena feud however.
I could have sworn he did comedy way better in 2001. Hell, even his return promo in 2011 was the best comedy he has done until today.