I run it at least once a day. Have completed Cure Elite once. Never gotten optional.
One-shots are a pain, but I think the real prob is strategy. On normal, you don't have to do 10% on the cubes (just like the generators in infected). And on elite, without doing 10%, it's so much harder, but people who've ran normals only, don't know.
I usually see one other person in each run that wants to 10%, then the rest invariably ignore/don't read it and botch it.
1 Cube goes boom.
Everyone panics and shifts from offense to kang defense.
Kang goes boom.