To be blunt with this. It is an amazing game. It is Just as free-roam as the first, allowing you to travel anywhere within the game boundary that you have unlocked. The fighting is much more interesting, different guards will use different battle tactics to try and kill you. Ezio's abilities far exceed that of altair, Ezio can climb faster, Blend much more easily, can disarm enemies, and can even swim (unlike altair who, if placed in above knee high water somehow drowns). There is much more weaponry to choose from, Including Axes, Knives, Hammers, a claymore, swords, and even a gun, leaving multiple ways open of how you want to kill your enemy. Adding the element of water travel opens up many more methods of reaching your target as well, instead of a heads on assault you could easily swim around and flank your target, Leaving your health meter intact. The addition of a second hidden blade allows for double assassinations, helping you clear out your targets two at a time rather than just picking them off one by one. And lastly The storyline, although the ending is kinda insulting to the religious, other than that, it's good. I would highly recommend getting this game if you haven't already.
