Great graphics engine but that's about it. Game play is not that great and with the bugs, this game gets really boring.
And that's where the nice parts end. Combat is not that great a all. In fact is poorly done. Only because your character is overpowered you can deal with your enemies. In general even a boss can't do anything once you got him in you mouse button smashing "combo"(aka the 3 hit sequence). There's another witcher and it attacks and throws spells at you until you hit him the first time and push him into a wall...fight over.
The the bugs....
You can gather stuff from the ground very hard. It takes you some time to position you character in the right spot to highlight something so you can peek it up. Opening a door or using an object can be difficult. All the nice graphics are for nothing if you can't light a torch or open a door.
Another boring part of this game is the huge distances you have to walk without doing anything and when you get to the X spot on the map some mobs show up and you dispose of them with 2-3 sword hits. "Click' whatever you need to click in the game and walk back to the quest giver. And that's generally how this game runs. And it's the same map over and over. After some time you learn the map
Then you have your objects and inventory. Very small I must say. You can't keep more than 3-4 weapons and 2-3 armor pieces. You can gather a lot of crafting materials but you don't have that much to craft safe for some potions you need for quests. Then you have money and the only thing you use them is to pay prostitutes.
Great graphics but the game play is mediocre just as the fight system.