It's hard for any of us to make sense of the numbers.
1. ACA caused many to be thrown off policies.
2. Subsequent to that, many enrolled in an ACA plan, so was a transfer of previously insured, not newly insured.
3. Others subsequently went to a form of Medicaid.
4. Among the enrollees it is undetermined how many are paid -- and by the way, I always enroll in the fall, and always have to pay, and pay in January. I do not get any excuses, pardons or Executive waiver.
5. My rates started going up the year after the ACA was passed into law -- to the point that my 2014 rates are now 50% higher than in 2010. My rates were driven up (I certainly assume so) by ACA, but was done in stages leading up to the year of full implementation... sans the 38 or so waivers and delays Obama himself has put into place.
Summary: there is no telling now many NEWLY insured are in place-- paid and locked in to their precise policy so that if attempting to use it, they are "in the system" no question (as am I and my family). Compare that to the cost that has been huge in the disruption of the healthcare industry, cancelled policies, and restrictions of doctors or other healthcare matters unaffected.
Far as I am concerned, the idea was never to insure a number of uninsured, but to expand government. An yes, that can be messy. So the messiness of ACA is simply how messy it is to gradually take over a country and put it under stronger central government control.