Just finished AC Syndacate and I still think those games turned out to be very boring after the Desmond's arc closed.
I mean, the first two AC were great, something fresh, new, with an interesting story settled during real historical events. When Desmond's saga closed, the games lost the plot element pretty much, they are still located during real events, but the overall plot is all the same and nothing new, just something like "templars are evil and they are trying to grab the magic item of this game, stop them".
In particular both twins in Syndacate are barely characterized, the main missions are a slog, the title is the classic Ubi collectacon with copy/past sides to repeat for 200 hours.
At least I didn't pay for Syndacate thaks to a friend who lent me his PS4 copies, but still I feel like I burned 10 hours and this just to do the main with no sides at all.
The fact also in a specific point forces you to do side stuff in order to conquer quarters to proceed with the main story is very very bad in my opinion.