It may be slow, as not every combat system needs to be fast and flashy, but clunky it is not, it's actually a fluid combo based system, heavily reliant on character stats and skills.
Yep! It's not clunky.
My very longsword-capable son can vouch for it's fluidity - although he will also curse at the Master strikes system, which is, apparently, silly.
This thread also demonstrates how people's opinions on, well, everything can vary and how challenging it is to try to satisfy even a minority.
I very much enjoyed KCD combat and found Skyrim "okay". Either will be acceptable in 2077 - with KCD-style being preferred.
I'll say this, though, having recently played a fair bit of AC Odyssey and Horizon Zero Dawn - it's a bold, bold idea to render a huge detailed world in FPP only.
I'm a bit intimidated by the idea as a player. Intimidated, but also excited! Aaaaand planning to buy a head-tracking device...