I missed the last episode but I've watched the rest. I like it ok but Justified is far superior IMO.
Also, I have read a couple of the Longmire Mystery novels by Craig Johnson and was really looking forward to the TV show but it hasn't translated all that well for me. For one thing, what makes the books, or at least the ones I've read, good is the sense of humor through snappy dialogue between characters, which is absent in the TV show so far. The other thing (somewhat related to the first) that bugs me is that in the book Longmire has close, caring and interesting relationships with the other characters (particularly his dog and his secretary) but I haven't really seen that in the episodes I've watched so far. The casting is off for me as well but this is perhaps because the actors in the show are nowhere close to what I had visualized while reading the books. Katee Sackhoff, particularly, seems a terrible miscast to me.
I don't necessarily think it a bad show but hard for me to separate the books from the TV show. It just doesn't have the same flavor. I will still keep watching though and hopefully they will develop the relationships between the characters a bit better and introduce some of the humor from the book.