17. Assassin's Creed IIWhile the first game established the sprawling, history hopping world of Assassins and Templars, it wasn't until the sequel came out that things really got good. A game that addressed basically all of the problems of the first title, AC II also happened to introduce the series' best protagonist, Ezio Auditore de Firenze. A likeable chap with a smooth, velvety soft Italian accent and with two hidden blades (yes, two - remember how that blew your mind?), Ezio proved so popular he went on to star in two more sequels before retiring and giving up his crown to Connor in Assassin's Creed 3. On release, the game was astonishing: here, for one of the first times, was a sprawling, believable historical open world that was your playground. Climbing was improved, weapons were improved, the storyline was much better, it had Leonardo Da Vinci and everything about the game just clicked. Better yet, it didn't have wandering around barren wildernesses on a horse like the first game. AC gets a lot of abuse now for being an annual series, but the second game, to this day, remains the foundation of the series that will always be looked on fondly, particularly when we get buggy releases such as this year's AC Unity.