Yup I heard about this... By the way, I think it's great if you played the first five games in order:
- Assassin's Creed
- Assassin's Creed II
- Assassin's Creed: Brotherhood
- Assassin's Creed: Revelations
- Assassin's Creed III
Those tell Desmond's story and it's very interesting to play it in order... All the games after that aren't played by desmond. But after playing III I suggest playing those:
- Assassin's Creed IV: Black Flag <-(You Played it)
- Assassin's Creed: Rouge
Rouge starts sometime after Black Flag and ends in the middle of III timeline. The battle between Assassins and Templars is very interesting!! I didn't play Unity and the ones after it yet.... But I have hope in Origins.