Welcome to myswag. Hope you enjoy your time on here.
Your question is very subjective. You will get a different opinion from anybody who comments.
We travelled the Loop in 2014 with a group. We found the road OK, others in the group commented on how rough it was. A person's opinion will be based upon their previous dirt road experiences and their vehicle's set up. If the traveller is a novice, most dirt roads will be rough. If they have some experience, they are better able to judge based upon that previous experience. If their vehicle has OEM suspension, any dirt road will be rough. If their vehicle has "better than OEM" aftermarket suspension, which has been correctly maintained, then their experiences of dirt road travel will be vastly different. So read the feedback you requested but don't place too much emphasis upon it.
Safe travels and enjoy your outback experience.
Happy campin
KB