I had a lot of faith on that franchise, AC1 was certainly groundbreaking, but everything fell apart with every sequel, I no longer care one bit about it.
How was AC 1 groundbreaking? It was heavily criticized for its clunky gameplay mechanics and lack of mission variety. Some reviewers even complained that Ubisoft spoiled the game right in the beginning, by revealing Desmond in the Animus (to which, I agree).
The "Ezio trilogy" from the AC II games felt much more polished in comparison. I also found Ezio to be a more interesting protagonist than Altair - who didn't really have any personality to speak of, in AC 1.