Keep in mind, this is comprised of sending out a survey to 120 SEO experts, asking them to rank each factor on a scale of importance. Moz then uses that data, alongside of their correlation metrics to come up with a list of the most important ranking factors based on the responses.
This does not mean the list represents the actual most important ranking factors. In fact, one of the top factors listed, Google +1′s, has been claimed to not be a direct, unpersonalized, ranking factor.
Here are the top ranking factors according to this survey with this interactive chart:
For more details, see the full report here.
Also make sure to check out our Periodic Table Of SEO Success Factors.