I loved the movie, and thought the show was done quite similarly. After every episode I was left wanting to see what happens next. As for the finale, I thought it was done well. Molly does get rewarded for all her persistence and hard police work, by becoming chief. Gus gets to stand up and redeem himself as a hero, even if its vigilante style. Of course he won't get into trouble for taking out a known murderer. Shouldn't be necessary but he could easily a placed a weapon nearby Malvo's body to make it look as if he was a threat. If not i'm sure the local police would gladly tweak the facts in Gus's favor, they are surely glad to be done with Malvo, dead or captured.
Lester would not have gone quietly no matter what, he was bound to end up dead. He should have never confronted Malvo in the elevator. He was home free at that point and could have moved away with his new wife, a fool to the end he was.
I would have liked to see something else with the deaf hit-man. I was thinking that he may decide to join up with Malvo. Who knows maybe they will have a 2nd season and tie a character or 2 in from the first season. I would think the deaf hit-man would be an easy tie-in. I'm positive there will be some connection, minor or major, since the movie was tied-in through the money found in the snow.
Overall I really enjoyed the show. Just like the movie, great cast and performances. The story kept my interest as well. Just about 80-90% of FX and FXX programs are on my watch list, Fargo has been no different.