Better or Worse

Have you ever felt that you are nor here nor there?
How do you describe it in Chinese?
Well, the following phrase has definitely sum it well. If you are not really at the rock bottom and you are not really one of the very best, just make sure you are not too bad and don't be the worst.

比上不足，比下有余
(Meaning: Worse than some, better than many; to fall short of the best, but be better than the worst)