I always liked them. Far from my top choice of colors, but I think they looked nice on the Pontiacs at least, especially the '68 Grand Prix and LeMans...
My dad, rest his soul, never owned an interesting car in his entire life. It just wasn't a priority for him.
I've only ever owned one green car and that was British Racing Green. Wish I still had it!
My biggest gripe is that virtually every car you see now is black, gray/silver, white, or a variation of those. Very boring!