As i've said, i'm the same, i didn't like the game at first, but took me a until the 3rd playthrough to start enjoying it, now i'm hooked playing it, take a pause between missions & explore the map, also explore the gang camp, there's some good dialog between gang members.
Also, if your default horse gets killed outside missions whilst exploring the map, don't save the game, or go to the stables & buy another horse, instead come out of the game, & close the game on the console main screen, then reopen the game, & your horse should respawn near where you've made camp.