This show gets 5 stars for the first season. 4 stars for the second season and 0 stars for the 3rd and 4th season.
It all comes down to what attracted you to the show. If you started watching from the beginning as a western, than as things get into the sf/matrix conspiracy part in the 3rd and 4th season, you will be like "what the hell happened to the show".
If you are watching hopping for high tech sf and ai show, than you will have a hard time getting past the first two seasons.
If you are watching for the robots regardless of the surrounding environment than you'll be fine either way.
That is the major problem with the show. It radically changes target audience with each season. So it is very difficult to watch from start to finish. I recommend watching only the parts that suits you. Looking back at the show, if I had a warning, I would have stopped watching after season 2, since I like watching westerns.