The best replacement for black flag is tomb raider.

The best alternatives to black flag are rated as following:
★★★★★  tomb raider
★★★★★  flag
★★★★  thief
★★★  second son
★★★  ac3
★★  ghosts
★★  freedom cry
★★  ryse
★★  bad brains
★★  ac2
★★  dead rising 3
★★  gta 5
★★  ortho
★★  liberation
★★  dead kennedys
★  battlefield 4
★  black sails
★  brotherhood
★  blacklist
★  gta v
★  arkham origins
★  misfits
★  last of us
  killzone
  circle jerks
  assassins creed 3
  minor threat

Your alternative for black flag is not listed? Suggest!
Speaking about black flag, one probably shouldn't forget about henry rollins.

Other search terms related to black flag and their ratings are:
★★★★★ henry rollins
★ henry rollins discography
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Google Trends

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