Its not the polish that was bad.
I've played many 3d action-RPG games. Zelda, Monster Hunter, Dynasty Warriors, etc. etc. Witcher1's combat is by far the worst of the series.
Just... laggy, non-responsive controls. But in a bad way (ex: Monster Hunter is also laggy/non-responsive, but in a way that's "obvious" that the slowdown is purposeful and tactical. You need to be very careful about when you attack or not attack vs various monsters in that game).
Witcher 1's combat in contrast, has a lot of repetition and not a lot of depth IMO. At least, from what I remember. Witcher2 onwards had much better ideas of "fun combat" experiences.
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I can still go back to old PS2 era Dynasty Warriors, mash square and have fun. Its not about "dated graphics". I admit dynasty warriors is a mashy-heavy game with a casual mindset, but I think Witcher couldn't really decide if it wanted to be a punishing slow game (like Monster Hunter/Souls series), or a faster twitch game, and just weirdly plays in this unfun position between the two extremes.
Its fine to have a slow punishing game (Monster Hunter / Souls / etc. etc.), but you need a huge variety of bosses to keep interest. Witcher 1 felt pretty stale after a short time, since there's just not as much variety.
Somehow, I don't find Dynasty Warriors gameplay stale (despite being a square-mash simulator). I don't fully understand why however. I guess DW is more about positioning of the player-character (the enemy army is always winning where you are _not_ located, so Dynasty Warriors feels more like a firefighter simulator, where you're running around the battlefield trying to fix issues in the army... rather than really being a combat game?)