It took a while for the Keenan and the last class to get as good as they are. Its not Samberg, Keenan, Hader etc were good. Hader has even said it himself you arent really good till a bunch of years into being on the show.

Its gonna be really bad when Keenan leaves this year. Right now the strongest thing they have is Weekend Update. Those 2 have been killing it there. The guys need to start finding their reoccurring characters soon. Obviously easier said than done.