Brainfuck is not a bad language, it just has different goals. Esoteric languages in general can't be compared with general purpose languages designed to be useful.
I would call Brainfuck (and other esoteric languages) as an instance of what "critical design" as described by Anthony Dunn. The goals of critical design are to produce artifacts that get you to think vs. "affirmative design" which is meant to create usable artifacts.
