I think I've seen your plea for a sandbox world in at least a dozen topics by now - and I don't read every single topic.
The Witcher was never a sandbox game and it will never be a sandbox game, regardless how many topics you open or hijack about it. The Witcher is a story driven game and thus has chapters with seperate maps.
I think what you want, is to play Oblivion. Where you have a huge world, that waits for you to explore it back and forth and which you can fill with your own content. On the other hand, the story of Oblivion is very weak in comparison and interaction with NPC's feels completely different. Of course there are custom adventures, which are better than the vanilla main quest and which let you use the world of Cyrodiil. I've played some of them and it was very nice. But you can't compare that with a game like The Witcher. My opinion: Witcher is a game you CAN mod, to make it a little better or to your liking, Oblivion is a game you HAVE to mod to get a lange amount of playing pleasure out of it. But I digress.
You don't like the talent system (and don't use them and the advanced tactics, apparently), you don't like the world, you probably want to customize Geralt even more than the hairstyle, which is a big concession and fanservice as it is. Maybe The Witcher just isn't the game for you? Maybe your definitions of a good RPG are largely different from what RED's are, maybe you don't even like a complicated story. Or your calling is to make it that much better than it is. Then get to it, but instead you keep nagging other players with your very personal wishes for a completely different game. Why do you think that anyone here would change that for you and, most importantly, why are you so dissatisfied with the game as it is? I ask this, because you don't talk about issues that a lot of other players see as a design flaw or bugs or anything that doesn't work like intended or wanted. But you find fault with the very core of game design. There's really not a lot you can do about that, except play a game that is more to your personal taste.