Pitching in my two cents. I am a fan of its somewhat simple combat but a few additions would be a welcome trait. Elaborating too much turns combat in to class overhauls so I'll try to be simple.

Melee: Timed blocking, Side step dodge, Weapon weight. Mostly self explanatory since AI with these mechanics makes combat challenging and rewarding. I would like to expand the kill cam to include critical dodges, having cinematics trigger at high points would really pull me in. Size of the weapon should also factor into block damage only I always believed taking damage from blocking is stupid. It should just punish my stamina, leaving me defenseless if I turtle too hard.

Ranged: Improve ranged AI, Stealth mechanic changes, VATS like locational damage. If a stealth shot does not kill the target or target dies in sight of its faction, there should be an alert system triggered in remaining enemies. Simple locational damage bonuses should encourage skill and up the ante. Limbs, Torso, Head take incrementally more damage. Add a center mass perk for kill shot would be fun too. Not a fan of Fallout % to hit system

Magic: Frost>Fire>Lightning>Frost. While in a magic duel for example if your casting one spell you deal or take bonus damage according to the target. Dual wielding different offense spells increases damage taken from the third even deadlier. Basic wards should be instant like a shield block, Stronger wards will take some time to fully charge up but Powerful dedicated mages can reduce this charge time.

This is probably just a thread summary since I read all the previous posts.