^I completely understand the desire to not have sports or TVs at every bar. We're a little over-obsessed with it right now, but you don't get the social environment at home during a game that you do at a bar; and given the cost of going to a game in the area (especially Sox and Pats), it's the closest some can get to the real thing.
In a nutshell, being at a sports bar allows you to scream and rant along with other drunks so you can avoid the strange looks from the children, wife, girlfriend, roommates, or whomever you live with.
That being said, my favorite (keep in mind, smaller sampling than most of the members) is Boston Beer Works. Game-On's location is good, but it's highly over rated. If you want to wait in line, go across the street to the Cask for a better experience.
By the way, I think the Cask was rated #2 baseball bar in America by someone... there's (was?) a sign hanging out front advertising that rating.