Camberville is definitely not the suburbs in the way that OP seems to mean it, and a red/orange stop here to me is the subway (rail to me means commuter rail). Camberville also isn't a place to save on rent in the greater Boston area. It's basically the best of all worlds - tons of public transit, lots of options, universities and zipcars and buses and walkable. To me, it's preferable to live there than downtown. And I would say you definitely don't need a car there. But it comes at a premium.

I did check on zipcar prices - they start at 83 from what I can tell, for a day. In Camberville, I'd totally still use one and ditch the car. But I think OP would be living further out since that area is not really cheaper.