I finally, finally got around to watching this show last year; I'm in the middle of season 4 right now. If Netflix gets the fifth season up soonish, I might even be caught up in time to watch the final season as it airs!
I hardly need to say it, but this show is great. I was always a little skeptical about whether Saul Goodman had the depth, and Bob Odenkirk the chops, to carry a show, but do they ever. Watching Jimmy's fall from criminal lawyer to criminal lawyer is so much more tragic and gripping than Walt's descent, just for how Jimmy really started with good intentions and got beaten down by the world. And his supporting cast— Kim, Howard, fucking Chuck— are all excellent too. The conflicts between Chuck and Jimmy are just delicious; "Chicanery" (S3E5) is some of the very best television I've ever seen.
But, that said… I wouldn't agree that the show doesn't have fat. I'd say that the Mike/Nacho/Cartel side of the show is actually quite fatty, spending a lot of time spinning its wheels, faffing around or just trying to figure out what story it's even trying to tell. Gus' arrival really gives it a shot in the arm and it becomes quite entertaining thereafter, but I won't lie, there's part of me that thinks the show would be even better if it just never left Jimmy's story at all.