I, too, have a very acute sense of taste. I dislike coffee served in paper cups because it tastes of the paper cup; when it's Starbucks' coffee, the burnt-beans taste and the paper taste between them destroy all pleasure unless the brew is doused with sugar, cream and flavourings -- which are mostly fake, so not very nice either.

It's enough to make this Canadian go to Tim's, where the bad coffee is at least cheap.