I don't mind Sam Adams beers. Generally not my first choice, but they're generally acceptable compared to the really big beer brands. I've never been a big fan of anything Dog Fish Head makes, but they seem to focus on IPAs and other "hop-forward" styles and I prefer stouts and other dark beers.
In a way, this is a good merger. Jim Koch has mentioned he's not a big fan of IPAs and other styles of beer that seem to be a DFH specialty and only reluctantly started offering IPA styles a few years ago. So when you think about it, the two companies don't really compete with one another, which is often a good basis for a merger.