Love the Prince of Persia series. The original was one of the first games I ever played (I still remember my dad tinkering with the soundcard until the music and sound effects suddenly sounded amazing). That's why I took an interest in the Ubi games in the first place. I bought the first trilogy from a discount bin as a 3-in-1 edition and loooved all three (even though two was a bit too teenage drama in my then teenaged opinion :P).
Special mention goes to the Anno games, wich I know is also not initially Ubis property (I started playing them with 1503), but they treated the series very well with 1404 arguably being the best game in the series and then traking it onwards to the future installemts. I'm looking forward to Anno 1800 as well.
Edit: And how could I forget Rayman?! I love Rayman! Rayman Legends is one of the best platformers ever made.
