I won't give this a ten, since they could still fumble his up. But. One season in, 8 episodes, 7 hours 20 minutes in, and we have 2017's best new series. I came in this with no expectations, and this little show has been a constant joy and a must-see/top-of-the-pile amongst all Sunday shows.
Sure there was this nice little movie from the mid 90ies based on the same Leonard story, but this is next level : great if not amazing acting from underused actors, great balance between dark comedy and lightness, mostly acceptable violence, very cool and unusual characters, the plot constantly surprises with supposedly great ideas systematically getting south, etc... It's quirky, entertaining, extremely well acted (Sean Bridgers is getting the role of his life with his mormon hired hand assassin turned on-stage screen writer!), charming, and it always leaves you wanting for more. Also, there's no character that is really annoying, and there's a variety of them.
Along with The Deuce and the Handsmaid Tale, the best new show I've seen all year, and maybe the best show of them all, at the very least the one that I look the most forward returning.
Edit (fall 2018) : I did give it a ten after second season, since this is The best show around these days, absolutely. Season two starts a lttle slower, but soon catches up, and even manages to give the show a very satisfying conclusion , despite that it was announced this was getting a third season. They probably weren't sure this was a done deal and wrote it as if it was the final episode, with open ended threads. Hope they keep on the same level.