There seem to be two types of bars here: corporate-owned, tourist-oriented faux-Irish megapubs and relatively comfortable holse in the wall. Having spent considerable time in both, I can say that Boston is a pretty good drinking town, although many bars lack the variety to which I'm accustomed in my native Rochester.
Still, there's plenty of Harpoon IPA, and that's just fine by me. Here are the better pubs I've visited so far:
There will be more. Tonight, my friend Patrick and I will be checking out an area microbrewery, although we've yet to decide on which one.