Should you give a negative review to a contractor if they go AWOL or have personal problems, but otherwise do good work?

When reviewing or rating or providing references to a contractor, should you factor in them going AWOL, not responding, having personal problems, being flaky, but otherwise doing good work? I've been rating them negatively, and it's been wasting my time when I have to look for someone else, but I'm wondering if I'm being too harsh.

Generally, a contractor's rating is contingent upon communication and project management in addition to the quality of their work. When I look for a contractor, I'm looking for someone reliable who does good work and communicates effectively.

Yes, please negatively review them. When I go to hire them later, I WANT to know that they did this to you. Its an important part of the decision making process - its ok that they do good work, but I wouldn't hire anyone with a history of bailing on a client.