Not sure it counts as a complaint, but I have to say I still think Black Flag is the better game personally (despite the desynchronisation nonsense, useless tail & eavesdrop missions and having to assault sea forts to open up the map etc).

While Odyssey is a good game it just felt overly bloated to me, after 90 hours I had just reached Olympia in the main story-line and still had half (if not more) of the map still to open/explore and had barely touched the Mercenaries/Cult of Kosmos stuff. At that point I literally couldn't bring myself to switch on the PS4 and play it anymore, so I did something I've never done before - I gave up and quit playing an open world/RPG without even completing the main story.

I'd like to think that I'll go back and finish it one day just to see how it ends, but I seriously doubt I will if I'm honest.