While it seems slim, I end up getting more 5.1 movies and shows than expected via the PS3. I usually don't check, I just play it and am often suprised when they are 5.1. This is mainly for stuff that has been recently added, so the chances are higher. In other words, it has nothing to do with the age of what you are watching, it has to do with when it became available on Netflix. With older movies, it is unlikely they will be 5.1.