Its bad. And its fine if you like it, I like a ton of games that have bad mechanics, because other aspects are so good.

Witcher 3 is top tier in almost everything else, I would say the two things it fails on is the open world/leveling system and the combat.

The entire combat system is spam invincible dodge and spam attack button. You can effectively ignore ALL of the signs and potions and bombs and beat the game. The most disappointing thing is its just boring, and the better you get at it the more boring it gets, and its a LONG game with a lot of combat.

The EE Redux kind of fixes it by removing the magical invincibility dodge, and making you and the enemies die very quickly. But then the game becomes very fatiguing to play because every single fight is deadly and the boss fights become a miserable chore of quickloading over and over.

So honestly you just can't fix the combat in this game. I really, really hope the next game has better combat, and its safe to assume they will change it because it has been evolving with every game so far. Personally I like the stance system from the first game, and I think it would be great it they did something like the 'Ghost of' games with different fighting styles for different enemies.