Repetitive, boring quests, flat writing, poor animations, recycled voice-acting, poor and unresponsive combat, quirky angles and uninteresting lore. And then you cite Mass Effect, Skyrim and modern Fallout games as an example of, what? The opposite? Those games fall flat on those points to such an incredibly higher degree than TW3 that it beggars belief that anyone would even go there. I hope OP is some form of parody or satire, it certainly reads that way.
I understand how it might not appeal to everyone, but the critique in the OP is against the very things the game is the most lauded for by far for doing way better than other games in the same genre.
In fairness to the OP i really like fallout and eldar scrolls games (not played any Mass Effect) buy i dont like The Witcher 3, which is a shame as i bought GOTY edition but it juat doesnt click with me at all.