There's obviously a continuum on the importance that art/aesthetic/sound has to pinball owners. I'm a strange mix of pinball slut and art snob. I can't really afford to be too choosey, but I also don't have a lot of space. That said, there aren't many games that if a wealthy benefactor walked up to me and said, "Here, have this free pinball machine", I'd turn down based on how they looked or sounded.
There are, however, a few I just wouldn't have in my house, even if free:
How about you folks? Any games too ugly or too obnoxious to have in your house at any price or condition? I could add a poll if any front runners emerge.