1. He's a Harvard Graduate
  2. He has a stable, private marriage with a non-celebrity
  3. He gets cast for the COOLEST roles
  4. He's as smart as he lets on in Bourne, Goodwill Hunting, etc
  5. He has a sincere and awesome bromance with fellow actor Ben Affleck
  6. He co-founded Water.org
    Suggested by @Starmist