Edited version of http://freestyler.ws/style/83840/youtube-centered-no-recomendations-no-comments
Creator of original is Xosen@userstyles

I've changed it a bit to hide just suggested videos instead of hiding them and sidebar...
I've also hidden Recommendations so if you open youtube on "home" tab you won't be able to see any of those videos.

NOTE: I know the player isn't properly centered but I don't know how to fix that...