Sometimes a blending house turns out a range of tobaccos with a pH that just conflicts with my mouth. Earlier in my smoking "career" I ordered a number of C&D blends as well as G.L. Pease tins, and just couldn't get along with most of them. So, I wrote the two off entirely. Flash forward to 2010 and I tried a few of them again. Delicious! So clearly, something changed.
Come back to McC in a few years, maybe they will "work" for you?
As for tobaccos I hate? Hmmm... I'd have to say Morley's Best by C&D, this one was like chewing aspirin :?: