It's definitely worth it. The only gripe that I have is that the controls can be a bit twitchy at times, but the ways you can go about assassinating people is great, the story itself is really deep and involved. They really did go a long way and improving a lot of the repetitiveness of the first Assassin's Creed. The cities are huge and feel more alive than in the first one as well. The main story itself is pretty long, coupled with things such as exploring tombs, finding treasure, and the side missions, you'll be involved for a pretty good amount of time. Overall, great game!