I recently borrowed this game, having played the original, and one word springs to mind when playing it... Improvement!
The first Assassin's Creed was visually impressive but the game play was repetitive to the point of insanity.
Ubisoft have paid attention and changed things up. All for the better.
Movement is better. Tasks and challenges are better. You can swim!
It's just nice to see a game sequel that learns from it's past mistakes.
Thumbs up for this one!