Way short - but worth it!
I was excited that the character was still Ezio. I liked him best. I loved the Italy theme from the second game and so I was pleased this took place shortly after, timewise.
Gameplay, controls, effects, graphics... everything, was just as before. This made it easy to enjoy.
I completed the game quickly. All stories complete, all quests done. The only thing I didn't do was find all flags and treasures.
I ran into a very disappointing feature in this game, it seems that the main questline was forcing you into the next, and the next, and the next. You couldn't just do one part and then do a side quest. At some point, I had no choice but to do one main quest after another, and because of this, I was forced to the end credits within a very short time frame from my starting point. Then the rest of the game became a bore.
My thing is the story, as long as it's going, I can go on. In this game, I just get bored when there's nothing keeping me there.
So that's the trouble I had with this game. I really wished the story had been longer.