The self contained one hour shows feel too rushed for me compared to what I consider to be the golden years where a single story would be told over several one hour shows, with a nice gory secondary murder just as the first episode was drawing to a close.
The big problem used to be that you risked missing the 2nd or 3rd episode, but these days with series link that's less of a problem. I hope they go back to it, even if single one hour episodes are more fashionable these days.