What is useful to know about a company and position before interviewing?

Salary, Role and responsibilities, Trajectory for the company, Perks, Culture, Leadership vision, Special projects, Team composition, Ability to do a 'reverse interview' - meet with your new team and interview them.

Just to name a few.

Comp range, role responsibility, team size, company trajectory and reputation. Other stuff would leave for due diligence if interview gets serious.

What separates someone from being 'good' in this role to 'great' ?