Yes it is worth getting, and if you like that kind of game, yes you should get it. I completed it tonight, I was trapped by it, not able to put it down or remove it from my console until I had squeezed every gaming moment out from it. I did it in 22:45:52, I enjoyed looking around the scenery, it was so well done. The cinematic sequences are amazing, although they are said to be longer than the game play, depending on if you look for all items or not. The story is gripping and the scenes are epic, it really gets you involved. It also has a good online, a very good online.
This is just my opinion, it is up to you.