If the lore, characters, story, and side-quests don't do anything for you, I think it's just not for you. I wonder though, what are some Western Role-Playing games that you think have done things better than The Witcher 3 here? I can name a few, but not many.
The problem is that things are so convoluted, everybody looks the same and have the same voices that I can not follow each character hours after I have finished their quest.
And sometimes it seems just random and pointless, ex: I see a quest mark in an area and go check: NPC: "You saved my girlfriend´s life. She can´t speak or react to contact any longer. Go fuck yourself your piece of shit abomination".
Boom! just wasted 3 minutes of game play.