The horses are great compaired to oblivion,but there reallly no faster than running and why cant I engage in combat while on a horse cmon????????????
Horses are about as fast as sprinting, and galloping on the horse (horse sprinting) is far faster than you could ever run...
As for combat, I'm sure Beth will add it when they can do it well. They took out severing (Limbs from Fallout) becuase they hated it and couldn't do it well. All these things will eventually make it in. They're just picking what to focus on sooner than later. Horse combat wasn't on that list.