Too much - too little, overachieving - underachieving, extremes are always damaging...but the truth always lies somewhere in the middle. The secret is balance, exercise it in everything you do.
It's easy to get caught up in daily routine, hate and depression, sometimes you need to take a step back and look at the big picture. And what is the point in judging someone anyway? Your judgement will not make either of you a better person.