I love them because they're comfortable. I look awful in them, though, if the definition of awful is that they accentuate my every fat deposit and my short legs.
I have gotten over it, though. I am now more proud of what my fat body can do on the bike than I am ashamed of how that body looks in cycling clothes!
Also, it doesn't hurt that I grew up riding horses, and during clinics and so forth we would all go out to lunch wearing our skin tight breeches with tall leather boots, including spurs sometimes. I got a lot more strange comments (and sound effects, neighing and so forth) from men in those than I ever have in my cycling shorts!
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury