PSEye doesn't have a monopoly on innovation. ^_^
While Sony didn't have a hit casual PSEye title like WiiSports, its PSEye implementations is indeed very different from Wii and Kinect. It is more meant for core gaming. The precise and responsive 3D control is in its own class, but -- too bad -- somewhat clunky.
Sony's focus on first parties and indies since PS3 days are pretty forward thinking. I remember some people on this forum mocked the strategy because third parties games like CoD, GTA were selling very well. Even though there was no major PSEye break, games from ThatGameCompany and some first parties showed us mind blowing titles.
They also pioneered advanced graphics techniques on Cell, such as MLAA, and heterogeneous computing. The big push for 3D gaming, while not successful in a big way, showed some of us what future gaming can be like. I look forward to try VR gaming next !