The noise, the relentnessness, the waste, the MESS.... We only had 6 guests and had it at home (DD's 8th) but it was still pretty horrendous.
We thought we'd save on wastage by asking them what sandwiches they wanted rather than plonking platefuls down - orders duly taken and delivered - plates abandoned at the end with sandwiches with ONE FECKING BITE taken out of them. Ditto slices of pizza. Some of them had piled up cheese and ham on their plates making it unusable but still without eating it.