Single malt is much better than even a good blended scotch. Try a Balvenie Doublewood or Dalwhinnie with a splash of water (not tap) and you will appreciate the difference.
As far as mixing scotch, I'll make a Rusty Nail once in a while. 2 parts blended scotch (Famous Grouse is my favorite) to 1 part Drambuie. mmmmmm