As long as the political undertones are done correctly, i don't see why this can't be a great series. I wonder where there starting this from though in respects to which royals are still alive or not.
I also hope that the build up to the elves providence and conspiracy isn't stupid.
There are references in the trailer to the First Northern War. But Ciri would only be 10 at the time, so if that is the setting then they've messed with her age a bit.
Or the first war could be covered in flashbacks and the show could take place during the second?
Yennefer's story is similar; either they've played with the time line, or her back story is told through flashbacks.
The games take place some time later, during the Third Northern War.
On viewing the trailer again, I suspect it'll be the First Northern War and no flashbacks. Ciri will just be older than she was in the books, and Yennefer's story will be taking place during the war rather than before it. The other advantage here is it leaves the showrunners with plenty of material for future seasons, before running in to the games.