I never found the Cube's D-pad as problematic. I think it's better than Nintendo's previously flat d-pads, and far better than the SP's d-pad.
Also, I disagree about the Classic Controller's influences being the Dual Shock. I finally got a hold of one today, and it feels and looks much different in person. From the shoulder buttons to the d-pad and analog sticks, the controller is much better. I think the shape is a meld between the cube and the SNES controller almost perfectly. Considering that Nintendo probably believed the Wii would sell first to Cube owners, they placed the D-pad in the primary position, as any of their gamers probably would have a Cube controller if they needed an analog stick there for a VC game. That only leaves the secondary position for the analog stick, and then when you look at the position of LZ and RZ, it becomes more evident that the controller is Nintendo's independant design, and not that of a copycat. That's only my opinion, though.