I like patina. Probably a carry-over from all the carshows growing up in the Rustbelt. Cosmetically crunchy, but mechanically far from original. That's my MO.
That being said, I have a few bikes that are just too nice for me to ride. On any given ride, I may cut through gravel, single-track, railroad beds, or even city streets to make loops in my area. Some of my vintage 70s and 80s road bikes are just too well preserved for some of my tomfoolery.