How can they even claim this? Where are they getting those numbers from? Also, isn't Ubisoft notorious for making so-so PC ports of their games?
Their ports usually aren't *too* bad (they range from the pretty good, like the Prince of Persia games and Beyond Good and Evil, to the middling, like the Assassin's Creed games and Driver: San Francisco, to the downright awful, like From Dust and the digital-download version of the King Kong game), but they're notorious for saddling them with the worst DRM available at the time. From disk checkers that could actually destroy certain disc drives, to limited install activations that could be used up by something like changing your graphics card, to always-on DRM that would boot you out of your singleplayer game if you lost your internet connection for more than a minute or two. You name it, and they've saddled their customers with it.
Recently they've been improving somewhat, eg their new Uplay service has an Offline mode that actually works consitently and doesn't require you to activate it before you can use it (unlike Steam's offline mode), but depending on the game you might have almost no DRM at all (eg, Driver: San Francisco, From Dust), some minor bonuses removed if you aren't online (eg, expanded ammo capacity in Assassin's Creed: Brotherhood), or some fairly major parts of the game not working unless you're online (like the Ark feature in Anno 2070), or the aforementioned limited activations (again, Anno 2070. It's like they looked at their recent releases and went "Holy [censored], we forgot to cripple our games with pointless DRM! Quick, put everything we've got into this one!")