The warmest of greetings to you!
Worlds (meaning: settings) usually have a common theme, or multiples of them. Some are dystopian to the core or support honorable actions. Others may have layers upon layers of secrets, waiting to be discovered, and so forth.
The world of "The Witcher", written by Andrzej Sapkowski, is near to the first example, with some bits of the others here and there and a generous serving of "fairytale, but for adults", including brutal murder and sex (consensual if it's involving the protagonist Geralt, but there's also quite a bit of rape in numerous backstories).
"Hey, but what about the games? Are they good?"
Well, thank you for offering such a conveniently placed segway, audience member who may or may not be entirely fictional!
To answer the question that was so graciously provided: I guess so? Every game in the series has it's own faults and curiosities, with large variances from game to game. The first installment told it's story in a very linear fashion, the second game went deeper down the hubworld-hole and the third is as much open-world as a storydriven RPG can possibly be without seriously impacting the telling of its story (shame on you, The Elder Scrolls-series. Shame on you.) Combat is hardly good, but at least serviceable in the first two games, although the second installment feels quite boring after a while - more so than the first one.
Back to the title of this post: As a place to play in, the Witcher's world is very exciting. Lots of interesting characters; choices to make that aren't just black or white. Makes for a world that is easy to immerse yourself in; especially when you feel like you are making a difference. Having an impact on the story is a huge deal for immersion!
But! Would you really want to stay there? If you would be a citizen of the world the story plays in, would you have a good life? In the Witcher's world, the answer just has be no. Because noone has a good life there. There are no happy people. The only good, decent folk you meet are those that live in monster infested areas. Monsters that easily disasseemble a normal human being. If the portrayal of the setting in the games is to believed, then there's really no reason not to shiver and cry every time night falls. Those that aren't under constant threat of being dismembered (meaning: those behind walls) are either massive scumbags or the victims of intense racism.
I guess what I'm trying to say is:
Even the non-player-characters in a fictional world deserve to be relaxed and happy ever so often. Even if it makes for a slightly less exciting setting.
May your life be filled with the kind of happiness you never get bored of!
