My wife has completed it and I've played about 4 hours worth. It improves on every aspect from the 1st in a great way. The one thing that trips a lot of people up is it's pace. It's strong on the 'sim' aspect, so getting off your horse and leashing it up to a water troff when you're in town. Going to your horse to change weapons from the saddle bags as clearly you can't carry 10 guns unlike GTA V.
Movement feels weighted and clunky until you get used to it as well, which is a major complaint from people but it's because it goes for realistic movement over overly agile character movements.
Sounds perfect to me, I have strongly desired a "sim" like wild west game for many years and this should deliver nicely by the sound of it.