I'm not going to lie- I'm annoyed. I'm annoyed that American audiences have such a hard getting behind shows that demonstrate a little bit of intelligence and ask their audiences to think a bit (I guess that Madmen is sort of an exception to this rule, but by all accounts, Madmen has managed to stay on the air at least as much because of the displays of retro fashion and the glamorous look of the actors as opposed to genuine interest in the story lines and events of the show).
I'm also a little annoyed because whenever I finally do manage to find an interesting show, it seems to get yanked off the air in the middle of a fairly complex, serialized story. It's hard to want to keep getting invested in some of the more intelligent, complicated shows when you know that there's not much of a chance that you're ever going to see the show reach a satisfactory conclusion. (right from the get go I was worried about this with Rubicon- from the first episode I suspected that the show would ask too much of a mainstream audience, although I held on to hope that A&E might be a network where the show could find viewers)
Terminator: The Sarah Connor Chronicles suffered, Caprica, and now Rubicon, all thought provoking shows, have recently suffered this fate. The networks keep trying to bring us something better, but television dramas with decent writing just have a really hard time surviving- while reality shows (e.g., The Jersey Shore) continue to rocket along in the ratings.
With very few notable exceptions, people just like flashy, bite sized pieces of entertainment that they don't have to think about too much.
Incidentally, I think that a lot of voters operate under the same parameters when deciding who to support. But that's a whole different conversation...