As any fule kno, Scotch comes in several levels of desirability. So does non-Scotch whisk(e)y but that's another discussion.
Sub-basement: Nasty blends of industrial grain alcohol with a meagre admixture of the cheapest, roughest malts. [Covers nearly everything that isn't labelled 'Malt'.]
Basement: Somewhat malt-heavier blends, often heavily marketed and usually at a price premium exceeding their value. Major example: Chivas Regal.
Ground floor: Vatted or blended malts. No nasty grain spirit. Vary from nigh-undrinkable to very good indeed. An example of the good stuff: the regional blends from Douglas Laing, like Big Peat.
Upper storey: Single malts. Vary from fairly bland but non-poisonous to distinctly characterful, complex and delightful. Region and style according to taste of course, barring the next level.