This season had big shoes to fill after the marvelous s3 and it definitely failed, but I liked the first and last part of the season. The absence of Nacho was a huge hit for the enjoyment of the show; the Saul/Kim-Mke-Nacho dynamic worked wonders, but when the former two(three) shared all the screen time, it fell flat in some episodes. I think part of the reason was the fact that Saul was not a lawyer. I couldn't give a rat's ass about Mesa Verde, and one of the most exciting shit was the whole Huel story, where we could finally saw the Saul we love/hate once again.
I hope season 5 will be the last one, and it will focus on the inevitable... they have so much ammunition to punch is in the gut repeatedly, that I'd be surprised if they let us down.