I love it when the Cowboys aren't playing on Sunday afternoon. I can either get some work done, or (more likely) totally focus on the other games being played. Sunday Ticket isn't as much fun when the Cowboys are playing because it just distracts me from the Cowboys game.
I also find it harder to enjoy SNF and MNF when the Cowboys aren't playing because there isn't another game to flip to during commercials.
On the Marshawn Lynch thing - the only thing worse than seeing some player rack up a bunch of yards and TD's against the Cowboys is to have them on your fantasy roster and have benched them out of loyalty. Maybe if you're the superstitious type, it makes sense, but I always take the POV that whatever happens was going to hapen anyway. A better reason not to start ML is that he's going to get stuffed, and the Bills will be playing from behind. I also have him on my roster, but I have MBIII, DeShaun Foster, Addai/Keith, and Ahman Green. I'm starting Barber and Foster.