I think having Walter and Tambor play their own younger versions of themselves was far funnier in the first 3 seasons than Wiig and Rogen, who both feel more like a distraction than a comedic beat.

The show seems to be flat: there appears to be a lack of energy in the directing, editing, and sadly the acting (which could also be due to both the directing and writing) when compared with the past 3 seasons of the show.