I will say this: Don't let your Fire & Sword experience cloud your view of the entire franchise. D2D is offering Warband for six dollars, I see. It is absolutely, 100% worth it, and it would be a shame not to experience it based on the flaws of what is, really, a largely unrelated game in Fire & Sword.
And that's especially true when you start factoring in the various mods that are already out there for Warband and are capable of adding even more once you're itching to move on from Native.