There was a long thread on a similar topic here:
For what it is worth, Google provides an interesting perspective on this topic that we’d like to share:
“You will sometimes find high ratings on the Better Business Bureau (BBB) website because there is very little data on the business, not because the business has a positive reputation. However, low ratings on BBB are usually the result of multiple unresolved complaints. Please consider very low ratings on the BBB site to be evidence for a negative reputation.”