I won't even consider a bass with (in no particular order):
Paint - if the wood is good enough to be made into a fine instrument, it should be good enough to see.
Stringtrees - a cluttered, drag-inducing design shortcut. A well-designed headstock is compact, tilted-back to provide a good string breaking-angle over the nut, and reinforced with a volute.
A cheap plastic facade (so-called pickguard) - another unsightly design shortcut.
A bulky slab body - Yet another unsightly design shortcut. Decent ergos and aesthetics matter, and that means deep flowing contours and deeply rounded edges.
Less than five strings or twenty-four frets/fretless stops.
A bulky heel and/or shallow cutaways - what good is a two-octave (minimum) board if you can't reach the highest notes in good position?
A short upper horn/poor balance - a bass with neck-dive is broken.
Four or more tuners in-line (and cartoonish elephant-ear tuners in general) - awkward and looks awful.
Weighs over nine pounds.
Poor truss rod access.
I dislike wide string spacing, too, but I can live with it if the rest of the instrument is up to snuff.