Fringe is getting tighter this season as far as plot lines go.

I can discount the grandfather thing in Alcatraz. I don't believe they've provided enough information for us to say it's a big hole. Sometimes I have the same critiques about plot as you've mentioned and then the show turns to effectively fill the gaps. I have a feeling that's going to happen here, especially since it's getting obvious the grandfather character is going to play a much bigger role as the episodes progress.

I can also discount some of the wooden and cliché dialog in Person of Interest, because otherwise the show is rather good. I believe it's the only drama I watch on CBS and only the second CBS show I watch after How I Met Your Mother.