Best: Commanding Other Assassins: In the next entry in the Ezio trilogy, players get to help start their own chapter of assassins. Sure, this involves some busywork, but it also means you eventually get the ability to command assassins with a simple button press. And it rules! Walking through an area and using your assassins to take out guards one by one, without having to lift a sword, is still one of my favorite video game memories.
Worst: Sequel Onslaught: Assassin’s Creed II was released on November 17, 2009. Brotherhood was released basically a year later, on November 16, 2010. This was the start of yearly installments of the franchise, and that’s not even counting spin-offs, mobile games, DLC, and ports. The final game in the Ezio Trilogy, Revelations, would release almost a year after Brotherhood, cementing this pattern and leading to some becoming burned out with the series.