Sanjay:

The processed activity in the rears is exactly what I hear and It sounds false, mechanical, and definately not what the mixing engineers had in mind. I know what the original elements sound like, and how they are mixed into the surrounds, and this is not what I hear with post processing. I don't know how else to explain it - it is a night and day comparison for me when I hear it, and every time I opt for the unaltered version. It messes up the integration with the fronts for me, and again, it's not something I can put a scientific scale to other than I don't like it.

I deleted the "6.1" because some films are mixed in 5.1 with the surrounds split left and right.