Annualizaiton of any franchise is open to free-range criticism. Perhaps the iterations are too often. Perhap there's too much of the same idea constantly every year to see ANOTHER version of it. Perhaps it's not the best at what it currently does. There seems to be an exception for the Assasin's Creed series of games.
Don't get me wrong. Annualized Assassin's Creed games aren't exactly my jam; however, there is a quailty about them too many ignore. Outside of the boring as Hell "modern-day" segments, the Ass Creed games attempt to recreate different periods in the context of particular eras. Sure, it's the same core values of gameplay placed over different time periods, but it's on closer inspection that you begin to see the differences. AC goes into detail about historical context, including character, places, and events. There's enough provided to where we understand the narrative context of the characters provided and how they fit in with the story. Whether it's the first Assassin's Creed with the information on the Crusades, Black Flag's delving into the importance of plantations, or many of the other entries in the series concerning historical realities, Assassins' Creed (regardless of how they turn out) at least TRIES.
Call of Duty shits out yearly addentums to their 'blow shit up' graph. Assassin's Creed at the very least has in interest in exploring historical truths to enrich the experience. Assassin's Creed Unity is broken. Even to this day, it has some problems with audio, gameplay, and visuals, but at least it tries to incorporate the Assassin storyline in the French Revolution and incorporating real life people in this fiction. The very main protagonists are usually flawed individuals who are struggling against the society they live in for the sake of happiness and morality (more than I could ever say about most serialized games).
The AC franchise is NOT perfect, but at the very least, we should try giving credit where it's due where the developers spend so much time including the reality of these games.
Anyway, just my two cents on this silly topic.