How about "It's Always Sunny in Philadelphia". I guess it's like Seinfield where it makes fun of just everyday awkward situations. The lack of laughtrack just makes the situations funnier. The plot develops in a normal way, like nothing completely out of ordinary to get the show started, but they get into some really interesting situations. Like the episode where the guy is trying to get laid with a antiabortion girl, or when the guys are trying to sell their grandpa's old Nazi uniform, or the one where they get a new promoter for their bar but the guy turns it into a gay bar. Those things alone might not sound very funny, but when you see the episode and how everything develops, then it gets really funny.
Another FX series that only survived one season was "Overthere". Has anyone seen it? It was on a couple of years ago. Talking about character developments, the series follows a group of soldiers in Iraq. The situations where they are put in are not necessarily realistic for a group of soldiers to be going through all those things throughout one trip, but the situations are probably realistic (I am assuming) to the situations there. For example, one of the guys gets his leg blown off, they go in search of a Taliban soldier through a small Iraqi town, serving at checkpoints, loss of a family member in the States and dealing with being away from family and friends. The story was good and the ending always left you waiting for more from another episode. Unfortunately the show only lasted for one season and I have never heard of again.