I played both Witcher 3 and Fallout 4 and must say i agree with the results. Witcher 3 , while having its flaws, was a huge leap forward from the previous game . Fallout 4 on the other hand, while a good game, was not by any means a huge leap from Fallout 3/New Vegas. I think bethesda is seriously milking the last bit out of that engine (loading screens behind every door is sooooooo freaking immersion breaking, especially after Witcher 3 that has none of that ).
The Fallout 4 main plot is nothing compared to Witcher 3, seriously it's paper thin and almost confused with a side mission! Witcher 3, while i personally was dissapointed with how it ended, i definitely felt the story to be alot more "epic" and actually mysterious and interesting (like a good book) whereas the Fallout 4 story....meh..i just remember having to find my son and errr....what story?