How you answer this could also determine where the interviewer would like to place you within the organization, or what areas of continued education/training they may require of you in the future. Again, even though this question has the ability to create a somewhat negative tone, you can still answer it in a positive way. Show that you are making steps towards improvement as well. Interviewers do not want to hear "I care too much." or "I work too hard." They want a genuine answer.
"I care too much."
"I think that I could be a little more organized and that I can balance my work and my life better. I tend to get very focused on the day-to-day work, and I lose sight of the bigger picture. So now, at the end of the the work day, I write down a list of things that I accomplished and what I'll do the next day. That way I can focus on my personal life once I leave work, which refreshes me for the next workday."