Why not? University is hard, especially if you have a job and other responsibilities. In my humble opinion who cares if you got a 2.0, if you enjoyed it, and you think you’re up for the challenge of graduate school, do it. GPA is nowhere near an accurate assessment of a persons ability, I think often it is the luck of the draw; professors, assignments, structure, life challenges, it all has an impact. If you’d like some thing a little more pithy go with this: you are more than your GPA.

Godspeed