I believe that Flash Forward also suffered from writer turnover.
I think you have to choose your shows very carefully based on the long arc storylines. I watched a few episodes of Alcatraz, realized that they could drag it out for ten years with no resolution if they chose and just stopped watching.
How I Met Your Mother is a comedy that kind of straddles the line. I know that some of you bitch about how the story doesn't move forward fast enough, but I think that's less important than it being an episodic sitcom. I think the bigger problem here is that we want it to be over so we don't have to see Ted anymore.
Which is another problem with getting involved with these shows.
I really wanted to find out what happened on John From Cincinnati as well. I figured HBO would give it more time than they did.
Alcatraz is supposedly on the bubble to get canceled.
Just started Sopranos the other day.
Terra Nova was cancelled today.