I've not had most of the special IPAs that NeuroLAX suggested, but I would say most of my experiences with Sam Adams have been meh. They make good beers and they provide a great service in that they probably introduce thousands of people to craft beers. Most of what I've had of theirs is a bit on the bland side compared to other representatives for the given style. That being said, if I'm at a restaurant that has a limited beer selection, I will get Sam Adams every time over AB-Inbev products, Corona, Heineken, or any of that crap.
If you guys haven't checked it out already,
beeradvocate.com is an awesome website where thousands of hardcore beer fans rate beers. I've found it very educational.