This thread is so gonna be closed because Bioware doesn't like the "CDPR vs Bioware" thing.
I think Bioware's writers just need a break. They all seem to have writer's block at this point except for Patrick Weekes, who's somehow getting better and better IMO.
Anyhoo, Bioware all but confirmed ME4 will be non-linear and player-agency-focused like Inquisition but let's hope they do take notes from Witcher 3 and sees that players want cinematic dialogues and not free-camera-with-oddly-placed-focal-point-and-zoomed-way-too-long-out and that we want Bioware side-quests, not WoW side-quests.
I do enjoy that every mission in the Witcher gets a cinematic cutscene, and like others have said, I do enjoy how the rather dull fetch quests are spiced up with appropriate fluff to not feel like one is completing a shopping list because 'reasons'. Though, these elements are not something completely unique to CDPR either, BioWare has used these same things in their previous games.
One thing that I would like to see taken from the Witcher 3 though, is the differing perspectives of the people and creatures inhabiting the setting. Not every fantasy creature in the Witcher is a mindless monster, in fact there are several instances where the non-human monster is less "monstrous" than the person that hires me to deal with the creature in question. That is what I really enjoy out of the Witcher, and something that BioWare has gotten away from in their subsequent titles, the world is greater than our human perspectives, it is inhabited by other beings that are intelligent and have their own motivations, but don't share our way of viewing the world.
I would really like to see ME:Next move away from the human centric view of things, and bring back intelligent, non-human aliens that are not mindless monsters, that can be reasoned and negotiated with, etc.
You're asking for too much because Bioware has always been very stark and blunt here. KOTOR 2 was a big deconstruction of the Star Wars IP that Bioware just closely followed with KOTOR 1. Writers who had an appreciation for complex character motivations have mostly left, and such were writers like Chris L'Etoile, though I think Patrick Weekes and John Dombrow are capable of being as perceptive too.
I think the art directors and general directors are a problem when it comes to not paying attention to the minutiae of the IP. I've heard stories about the art director who forced a writer to write in stuff that made no sense because it was cool to him and he was higher-paid, and for DA:I some art guy decided to SJW-ify the world by making equal amounts of all races and Mike Laidlaw gave a go-ahead to it.
The info leak about ME4 also revealed that it is indeed humanity-centric something about "finding ancient technology that advances humanity" or something. It's your usual Mac Walters kind of plot since he started his one-track mind about Cerberus.
A big problem I see within Bioware's work environment is that in two cases now, they've had a writer who wasn't really that good be promoted to being in charge of projects. Both Mac and Mike weren't great writers but now they can decide if something makes the cut or not, and their lack of understanding the finicky details of the worlds they contribute to means we end up with less believable settings.