They're useless. Resumes from people with online degrees get ripped in half. Shows the person was too lazy to go college. Nothing beats the experience of attending 4 years of college[or more, like Master's etc.], don't forget the networking/friends you make in college. An online degree can't get you the contacts and hook ups for internships and other jobs that you can get by actually going to college.
Let's not ignore this next one, what girls are you going to meet while getting an online degree? Good luck with that one.
If you're old and have nothing going for you, go ahead and get an online degree, it's better than nothing. If you're young, like teens-30s, and you want a college degree, then actually go to college.