Boston's is ok for drinks but the food is bad, the service is slow and unconcerned, and the place smells like beer and ketchup. Don't bother eating here if you want good seafood, you won't find it, despite the fact that it dominates the menu. Calamari is a disgrace. I have heard that the upstairs menu is different and better here, but I have mostly sat downstairs.
If you decide to go, go for drinks overlooking the ocean. This is one of the few bars in Delray right on the beach, and is much cheaper than the Shore. Boston's is an acceptable place to meet for drinks, hang out in the bar or upper deck to enjoy the people/sports watching and views. Have a tropical drink and enjoy the ocean breezes.