There's this one girl in my area that has dreads and she looks beautiful. The dreads just seems to suit her style well. But in general I don't think it's for everyone and many guys will probably find it a turn off from what I've gathered.
They need to be clean and well kept with no nasty smell. Only then is it OK (for either gender). I'm a bigger fan of dreadfalls as they're easier to keep clean, look nicer, and you can mix up your hairstyles more often