It's neither good nor bad. It all about what's best for you and if you can't or don't what to be on Facebook, there is nothing wrong with it. It has its benefits but like everything else, it also has is down sides.
I think it depends on how you look at it. its good that your not on it 24/7 but if you have friends on there that you dont talk to except thru facebook then they would probably think of it as a bad thing