Would you now? I think you would think a lot differently if you actually were in that situation. Suffering is entirely subjective. A great level of suffering to an individual that deals with it constantly is the exact same thing as no suffering to an individual that normally has none. It becomes the norm, and they learn to deal with it just as we learn to deal with the basic level of suffering each of us experience constantly. It becomes background noise, nothing at all. In terms of personal experience, they suffer no more than any of us, they simply are able to accomplish less because it mentally or physically handicaps them.
A greater life form may say the same thing about living like a human. That does not make human life not worth living, it just shows the greater life form is fundamentally ignorant of it.