I have the MGM channel through DirecTV. I would say that the quality was variable. Rollerball was awful, Witness for the Prosecution tolerable (considering its innate problems). I have stopped watching the MGM channel and many other movie channels, however, because I can't stand anything less...
I can second and support many of the suggested titles.
My principle point is this (and I hope that the TT folks are listening): I have eagerly paid top dollar for TT titles, and defended their business model on the boards and in many personal conversations. But the most important thing to me...