I do not believe one second DOS2 have become even near 10 million. Anyone can go and write review of games never played.
This is based on Steam reviews, which you can't make unless you own the game on your account. The game has also been released on GoG, 3 consoles, and iOS for some reason. 10 millions doesn't sound that farfetched to me.
DOS2 is in my subjective view bad game with silly comedy and does not change that fact for me.
On the other hand Skyrim reached 50 million sold and I complained to Kingdom come about Skyrim including example what is up with the freaking grey tone graphics in Skyrim? I did say something good about Skyrim like its low system requirements (you can play Skyrim even on mobile phones) and I said it is subjective taste what games people like.
I have not complained about Witcher 3 anything and I like it is for adults only.
As someone who played Skyrim on release, back in 2011 it was really something. I guess it shows how far we've come in 11-12 years. The reason Skyrim is aggressively grey is because each Elder Scrolls game has its own aesthetic. Oblivion (2006) was very brightly colored, high fantasy, Peter-Jackson-Tolkeinian aesthetic that bordered on the cartoonish (at least with the NPCs). Morrowind (2001) was deeply brown, red, swamp green, and almost alien in its aesthetic. Skyrim got the "everything is the far Northern part of Northern Europe" aesthetic end of the stick, which is very grey, tundra-like, and desaturated. I also think the "everything is dark and gritty and grey" aesthetic that came about somewhere in the 2000s had an impact.
Remember the human (This is a forum for a video game):