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?

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.