It all depends on how much time you've got on your hands, and how much you can afford.
Personally, I wouldn't be able to go back to graduate school if it weren't for online programs. I HAVE to be able to work full time to support myself, so an online degree was really my only option.
If you're worried that it won't be accepted by potential employers, take a look at this article from Reuters "Online Degrees Now Widely Accepted By Consumers and Employers"-
Online Degrees Now Widely Accepted by Consumers and Employers | Reuters