1, Black Flag, just a really fun 3D naval combat/pirate game, the Assassin's Creed parts were fine enough, and Edward is the best character since Ezio.
2, Brotherhood, improved on 2 in pretty much every way, and did so before it got stale.
3, AC2, amazing game that Introduced us to Ezio and (for better or worst) "Ubisoft the game". Also really put the franchise into that super money printing machine it became after a successful yet underwhelming start.
4, Syndicate, just a really fun return to form, with 2 great new protagonist.
The rest I either haven't played, or didn't like it enough to list.
2, Brotherhood, improved on 2 in pretty much every way, and did so before it got stale.
3, AC2, amazing game that Introduced us to Ezio and (for better or worst) "Ubisoft the game". Also really put the franchise into that super money printing machine it became after a successful yet underwhelming start.
4, Syndicate, just a really fun return to form, with 2 great new protagonist.
The rest I either haven't played, or didn't like it enough to list.