HH also has a 4 year 80 proof green label which can be thin and a bit hot. I haven't seen the green 6/90 outside of Kentucky or Tennessee.
We're Bourbon Geeks, it's who we are, it's what we do.
I can't even think of a terrible one I've had... It helps that I got into bourbon after my immature days (Translation: my drink-to-get-drunk days. Translation: the days I bought the cheapest crap available.) So I've never had anything bottom shelf, and nothing mid-tier or higher has completely turned me off.
Not quite bourbon, but the regular James Pepper Rye is about as terrible as they come: hot, young and one dimensional (funny how that is opposite to what I look for in women...I kid, I kid). In all seriousness, avoid James Pepper Rye.
I'm not 100% sure it's even bourbon, but while cleaning out my parents' house I came across a bottle of Corby's. Took one whiff of it and stood up straight. Took one sip of it and spit it out. The only whiskey I've ever poured down the drain. Too bad my dad wasn't a bourbon geek, I could have taken my inheritance in SW juice or something.
Some Old Heaven Hill bottled in the early 90's. It made me go partially blind for 2 weeks...
"The Road goes on Forever and the Party never ends!"
- Robert Earl Keen