To be honest, I've stumbled on some bad mixes, where too many different tobaccos in the wrong proportions, and various flavorings really burn hot and harsh. My best mixes are usually a little bit calculated. If you put good quality burley and Virginia in equal parts, and add a pinch of nice Cavendish, it will probably be tasty to excellent. For us non-blender types, usually fewer tobaccos will produce a better mix. Russ can put together six different tobaccos and come up with a classic, but that's because he's Russ.