I always find it odd how often these come up in discussions; I had hoped everyone had figured out by now that The Descent and all of those similar maps are just freaking terrible.
Seconded. I don't have much else to add that isn't already said here.
QPs were a terrible idea that should've stayed just in Poundemonium, where we can deal with them as a weekly option rather than having them forced upon us.
Also this. Spawnrage is bad enough when it's one Fleshpound out of many; when it's multiple spawning in the bad ideas become even more apparent since spawnrage invalidates a lot of options for takedowns (you know, the clever mechanics players should be mastering to deal with Fleshpounds to encourage not taking hits in the process).
The wave is bad because QPs are bad and spawnrage is bad.