See them a lot. I don't look down at people who ride them because if it gets you riding, more power to you.
A coworker at my old job used to ride one. He lined the tires with tuffy liners because he got so many flats. Also, even though it had multiple speeds, he settled on one gear because the shifter didn't work after awhile. A fixed gear Roadmaster! He also replaced the original seat because the stock one pretty much disintegrated.