17. Assasins Creed II / PS3
Building on the incredibly innovative story from the opener in the franchise, this one opened the world up, made up for some frustrations (thank you for that goddamned horse and fast travel!), and added some other neat little features like swimming, eagle vision while moving, and Leonardo Da Vinci provides some enhanced 1500th century tech. With an incredibly complex combat system, lots of main and side missions (with both day and night-time cycles), this gave countless hours of exploration, and different attempts to win your battles.
Beautiful scenery (I remember reading an online blog/article somewhere at the time that someone roamed around in the game for their grandma, so she got a chance to visit Tuscany and Florence, and "visit" some of the famous landmarks), engaging characters, seamless combat with smart AI, and a very interesting storyline are all the elements that I look for in a great game. It was all right here. I never did play III, even though jingle.son did. I might give it a go sometime, but with mixed reviews there, I think I’ll just hang on to my memories of the sophomore entry in the franchise.