I think it depends on the band and how they are used. I would rather be in jail than listen to much of The Doors, only because the keyboards make me sick.
Then again, think about Angel Dust's "Bleed." Without that keyboard intro the song wouldn't be near as strong. If they are used well, they add to a band that is guitar based, if used poorly, they clutter and soften metal (guitar based) music.
Bryant