No such thing as too much. IMO, there isn't any "good" shows on network TV, like FOX, CBS, NBC, ABC. My favorite shows are either on FX, AMC, Shotime, or HBO, with the exception for some oddballs out there.
Most of the time shows don't overlap, especially if they're really big contenders, so it's not like I'm torn on what to watch on Sunday nights or something. Besides, with the DVR, it's not hard to keep up with everything.