Jolt, my son has the Blue Cross plan through the Connector. He goes to a doctor at the Brigham and had quite a choice of providers when he signed up. I think, unfortunately, you will have to shop around and find a pcp from the list they provide, instead of the one you want. I know the benefits he gets are quite good; everything except dental.
He works for a small company with 7 employees, so the state option was great for him. He had been paying for fairly reasonable private insurance, but this is a little cheaper. It is too bad that the practitioner you want to go to only takes the free care option people...
I know some think our state mandated insurance is "bad" or expensive, but for my son, it has only been positive.