Basses that don't balance. Headstock heavy basses should never be allowed out of the factory.
And that brings me to another point - any bass made after about 1985 when the maker decided to use old fashioned enormous tuners. There is just no need for it - heavy clunky pointless things that add weight when there was no need to.
I don't care how much of a 'Reissue' a bass is, playability must come first. I was so very annoyed when Fender put heavy old tuners on the new Geddy Lee USA model. It's not a relic, or a reissue, it's a new model. It should have had Ultralites or something equally light weight and well made. And it could have knocked off almost half a pound.