So to fix the combat in the Elder Scrolls games, you propose to make Backstabbing overpowered right out of the gate? AND add a QTE to game series that's otherwise stat-based? Sorry, I don't follow your logic.
What TES combat needs is more varied animations, reactions and sound effects. The system in place works just fine. It doesn't need an overhaul, just more features and expansions on what's already present.
First they could add a feature where your weapons could hit the level geometry, that would change everything. Suddenly, your giant broadsword has difficulty in tunnel, forced to only stab forward. Or if you try more sweeping attack, you get a great big crashing sound effect and a big drop in damage from the lost energy.
Second, they modify the blocking so that without a shield you only protect against certain directions of attacks. Now you've made combat a far more mentally involved process. And even if you are blocking, there's a chance of the attack breaking through, based on the different weapons weights and skills behind them.
Finally, make the different weapons speeds more distinct, based on wieght. Why? To make a risk/reward counter for the blocking. Your lighter sword is less able to block heavy hits, but better able to lay on a barrage of blows, trying to overwhelm your opponent's ability to block by striking where he's not covering.
Just some ideas.