Behind the Bastards has an episode about Jim Caviezel, and in it they discussed several anonymous and one non anonymous retelling of working with the man. If the allegations are to be believed, he kept being worse and worse not understanding his characters motivations, and they had to adjust some stuff to stop him ruining the show. They mention him doing stuff like actually harming other actors/stunt doubles if he was doing action scenes, a desire to just kill and shoot up enemies, and being really bad later on about following the script.

As someone who viewed Person of Interest down to the last episode, this was a series that started strong, followed with a solid 2nd season and at this point it was like watching two series at once, one taking in consideration the roots of the story, the other written by a teenager fan group, wanting to turn up the dial for more intrigue.

The way it ended was a coup de grace, more than anything.

Having not finished any of these shows I'm unsure of if the format is telling me they have good endings or not. I'm guessing not but I heard Fringe and POI are great.