somehow I managed to beat the first game but it was so bad that I have no desire to play the rest of the series.
I've always heard that 2 was much better though so I would like to hear why you think the original is better.
I appreciate the original game more for what it attempted to accomplish than how it turned out. Despite the monotonous mission design, AssCreed 1 succeeds the most at making the player feel like an actual assassin; this is something Ubi began to move away from beginning with the sequel and has since abandoned entirely in favour of a traditional action-adventure experience that simply makes shallow pretensions about incorporating investigative or stealth gameplay.
Edit: Having said that, Rennaisance Italy is my favourite setting of the series thus far (2's locales and Brotherhood's Rome more so than Revelations' Constantinople).