So I think I know one thing that would make melee combat way more tactical.
If stamina actually meant something.
All it does is down-grade power attacks to normal attacks. Which says a lot about what combat is ultimately about. Consider if stamina did the following instead:
-When your stamina is totally depleted, you take more damage.
-When your stamina is totally depleted, you move 15% slower.
-When your stamina is totally depleted, blocking is less effective.
-When your stamina is totally depleted, your magicka regen is reduced by 75%.
-When your stamina is totally depleted, you are 10% more likely to suffer an executing blow when hit.
-When your stamina is LOW, there is a chance successful blows will stumble you.
In addition to power attacks becoming normal attacks. You hit this point in game where stamina kind of stops meaning anything against 5/6th of the enemies. Dual-click...dual-click...move....dual-click...dual-click....victory! Even in the beginning of the game, I found that trying to play to conserve stamina actually LOST fights because they are just pure DPS races. I've also spent close to a minute and a half in combat dodging to regain stamina....and there's absolutely no value in it. In the time it takes to regen 30% of your stamina, a flurry of zero stamina attacks would have finished the fight.
Making combat about dealing damage while staying high enough in stamina not to be completely vulnerable I think would be a good thing. It would make 1v1 fights waaaayyy more interesting, and would make large melees incredibly dangerous. It'd also really place a penalty on dual-wielders, keeping in tone with their pure offensive style. Likewise, heavy armor fighters who play slowly and meticulously would actually have a sort of rock/paper/scissors response to light armor types, by just letting their enemies tire themselves out then cleaning house. Mages would get the benefit of melees actually getting tired while chasing them.