I don't know about Boston....but as no-one has answered your post at all, I thought I'd do my best.
When it comes down to it, the only way to find out if a martial art AND instructor are good for you (they both need to be in place for it to work) is by having a go and finding out.
1. Does the mart place a lot of emphasis on competitions? This can be a good thing, but be careful if they are constantly asking for money for their own internal tournaments 9as opposed to all-styles tournaments) such places are usually close to a scam and you probably won't learn much.
2. Do you respect your teacher? If you don't, or if you have your doubts, leave. This stuff is way too important to leave to the mendacious or incompetent.
3. What do you want? The best teachers/styles will not only feel good for the way you naturally move (we all move differently and although every teacher I've come across talks about 'training schedules tailored to your individual profile' this is largely rubbish. They usually don't change - so if they're not right, move on (picking up a theme here? :-) Do you want fitness, do you want sport, do you want to fight if things kick off in a bar. A couple of weeks in a place will let you know what works for you. I now train in a style of kung fu that is extremely mentally aggressive and places a lot of emphasis on generating force by body movement and breathing - it's not bullshit, it's simple mechanics and it works. I love its techniques and its dark edge, but it took me a long time to find.
4. Once you're happy with it - commit. It will take 5 years+ for you to become really good at it. But when you do, it will change you for the better in a very comprehensive way.
I can recommend places to start if you let me know what you want with more detail.
Peace (and therefore prepare for war, lol) Steve