I've travelled the A380 on a few dozen flights now; Emirates, Etihad, Qantas and Malaysian. Yes heavy bangs on landing seem more common than on other types. I tend to favour sitting towards the rear of the cabin (that's where the empty seats are going to be) and landing is definately louder there than elsewhere with the occasional extremely jarring arrival.... The A380 also seems to be a rougher ride in turbulence than say the 777 (subjective view I agree)... plenty bumpy enough to get close to spilling your G&T - but not quite.
On the plus side the A380 is definately quieter than other wide bodies, with the possible exception of that stupid bar at the rear in Emirates Business Class where the background noise seems well above that required for quiet conversation.