Refusing to participate in content (as in, bolting straight to the portal and not doing anything other than self-preservation) is against ToS. It won't help YOU while it happens, but reporting that player may help people in the future.

If such actions would be properly reported and ToS properly enforced, people would stop doing such stupid things. If you're bored of the deep dungeon then don't use it, simple. Normal dungeons offer perfectly fine experience as well at all levels. Just go for the highest one available and you'll be able to switch em every four-six runs, I reckon.