A resume does a good job of describing specific skills. Today I had lunch with a group from my last contract and then an evening of pampering with the women I work with in my current role.
Reference checks and resumes don't tell me how awesome you are as a person or why your ex-colleagues still love being around you. How do we judge a person's character when all we have is a list of jobs?
I think it's a combination of what is on paper and what you see in an interview. Let people reveal themselves face to face. Talk to people who know them. Look for character as well as a checklist of skills.