If I'm having a mixed drink (soda + alcohol - 99% of the time bourbon-based), I'm fine with well.
If having a proper cocktail or having the liquor straight (either neat or on the rocks), wouldn't touch it.
That said the definition of well can vary a bit -- at Delta SkyClubs it's Jack Daniels which I'm actually fine with straight up but of course you go to a random bar nearby Jack could well be a premium liquor