That's going to be different for everyone, since each domain investor (Or end user) put heavier weight on different metrics they can leverage to achieve their goals.
For example:
- A domain investor thats monetizing through parking revenue will gravitate to traffic
- A domain investor looking to manipulate ranking data through redirects will gravitate to DR and Backlinks
- An End user looking to capture leads for their primary brand will focus on quality traffic sources/referrals
- An End user looking to build a trusted brand will look at the spam score and email blacklists
- etc., etc....
And that's just the tip of the iceberg...
In short, it's hard to give you a blanketed answer since there are way too many different types of buyers with different agendas and uses for the domains.