When MassCare passed, it was supposed to lower the average cost of health care by getting relatively cheap young people into the system, and ending the inefficiencies of caring for the uninsured. Unfortunately, it hasn't quite worked out that way. The bill for the uninsured only dropped by about 40%; the young, cheap people turned out to almost all need subsidies, and worse, some of them figured out how to game the system by buying insurance, getting a bunch of expensive procedures, and then dropping the insurance again. There was a brief improvement in insurance prices for the individual market, because Massachusetts, with its community rating and guaranteed issue, had had a pretty sizable problem with adverse selection. But after a few years, insurance costs were still marching briskly upward, rates were among the highest in the country, and the system was putting heavy pressure on a budget that was already strained to the limit by the recession.
The Massachusetts governor's answer to this problem was to simply deny the Massachusetts insurers the right to raise their prices. Then, when they refused to quote prices on the exchange at the old, controlled prices, the government essentially argued that they were a bunch of whiny liars who didn't need all that extra money, and commanded them to list their insurance at the old prices. As far as I know, they never did find an actuary to sign off on the mandated prices, but the insurers lost their hearing.