Why TV shows and I don't do well

I may have blogged about similar themes before. If so, there's a reason.
It bears repeating.
I tend to get hooked on television shows which contain the following - decent acting, largely unpredictable plots and intelligent writing. There's a trend with most of the ones I've liked over the last decade or so - they get canceled, most of them slightly over (or significantly under) the typical five-year syndication window.
As I sat down to write this post, I got great news! "Scrubs" is coming back on the air!
This is another genre I like - insane comedy with a message. It's one of the reasons I enjoyed "My Name Is Earl." Though the essential format was the same each episode - there's going to be some issue Earl needs to rectify from his list and how they got to the end is what made it interesting.
So, here's hoping the resurrection of "Scrubs" will last.
What types of television shows do you like and do you feel "snakebitten"when your favorite shows go off the air?