I have played all of the AC games and have enjoyed all of them, however I enjoyed this one the least - There were so many glitches that resulted in multiple repeats of the same quest that I ended up just wanting to finish the game as a matter of principal not out of enjoyment.
At some point you will just start flying upward until the game shuts down
You will fall into mountains or walls and never get out
Enemies will see you with there xray vision
Your charecter with make up their own mind of where they will parkour
Your horse will either A: not come when you call B: come but not let you get on C: you will get on but it will go where it wants to. D: by sheer luck things will go smoothly
You will pick up an item that appears to be there - but - it is not - until you start the quest requesting it.
Your aim will say you can hit a target and one shot them, you will instead shoot anything but that target.
That being said, the river raiding / raiding was a cool addition. For the most part I enjoyed the story line though it seems incomplete.