Optional add-ons have rarely been successful, and Sony failed on PS3.
Microsoft succeeded as you say with Kinect, but most games for Kinect is still also kiddie games.
I have Move and Kinect myself, but my Move + Navigon have collected dust since release. Kinect is much better, and its quite responsive. Its kinda funny how the pointer lags on the game menus, while its accurate ingame.

All motion controllers have 1 thing in common..mostly party and kiddie games. Just look at the Kinect game list too.

Overall Kinect have way better game list than Move thou. Move's biggest weakness is that it requires calibration every damn time you use it. Why didnt they learn from Nintendo? Wii have 1 calibration for all games, and so does Kinect. Move doesent even have motion on Navigon like Wii does.
The coolest addon i have for PS3, is "The eye of judgement". The card scanning actually works with that old **** camera if its bright enough.
I have all addons for 360, Wii and PS3. Including everything for music games, fitness, quiz games +++
Music controllers is the ones i use most, because its fun at parties.
