I haven't played RDR2 but it's good to hear that they've improved the horse riding experience from RDR. Riding a horse in RDR sucked so much. It was frustrating and annoying and part of the reason I dropped the game and never went back. Another part of dropping the game was the terrible gunplay, though I've heard that isn't all that good in RDR2.
The horseback riding experience is much, much better than the first game. Gunplay is definitely improved, but there is still room for improvement. All in all though, I'd say it's within the acceptable range for the type of game that it is.