They hired the Witchers 3 quest designer its a done deal, this game will be awesome and will not feature any stupid meaningless fetch quests or the kill 5 wolves type of quest.

Depends who they hired. I just had dive for a black pearl quest, straight from WoW.
Kill 5 wolves is all over the game, except now it's find out what's haunting ...... and kill it.
Sure they add a bit of story around it, but you're still doing the same fetch / kill quests.

There are plenty awesome quests in witcher 3. I hope Horizons can avoid the temptation to pad it out with meaningless filler.

Are you seriously comparing the witcher contracts wich are incredibly well designed and involved, where you track the beast down using all of your enhanced senses, learn what it is, prepare for the battle beforehand, learn all the backstory of why that beast is there and is doing what it is doing, with a simple kill 5 of a certain monster type of quest ? The witcher contracts are amongst the best quests in the game, its Geralt doing what he does best.

And the pearl diving quest, wich admitedly is the closest thing to a fetch quest in the whole game, isnt just a filler either, it has a story that sets it up very well and makes it matter, the quest giver has a wife wich is going insane with some sort of mental diseasse and asks you for a very rare black pearl so he can try to show her that pearl he promissed in an atempt to snap her out of her insanity with, its definetly not your everyday fetch quest it fits the story and is much more involved with the world youre playing in.

No sidequest on The Witcher is a filler, they all fit the world, have a story and Geralt only does them because they make sense. Some of the sidequests are more involved than many of the mainquests and every main quest in this game is superb. The quests are by far The Witchers strongest point.

That wasn't my experience. I ran into the guy in Skellig, asked me to dive for a pearl for his wife, (got the quest there) no back story given. Then I got the pearl and he said meet me in Novigrad for the reward. I haven't gone there yet. Just a random guy asking me to check random oysters for a black pearl. That happens a lot in W3 that stuff happens out of order ruining the quests.

Track the beast down is nothing more than follow the red markers. There is a back story yes, the game play is the same every time. Why not read a collection of short stories instead if the gameplay doesn't add anything.
Treasure hunts are simple go here, spot the chests. Add generic bandit camps, guarded treasures, monster nests, abandoned sites, there is a lot of filler.

There is tons of great stuff as well, yet all the filler drags it down. I love the exploration and the characters and still play it every night. Yet after a string of generic quests I feel like I've just been doing busy work. 

The pearl guy either tells you the whole story once you deliver the pearl or you have to actualy ask him, Im not sure wich of the two. And witcher contracts, its OK to say you dont like the quest structure, but theyre absurdly different from your usual kill quest, there realy isnt a comparision to be made there, they feel like the actual work of a professional monster hunter like they were designed to feel like, and every one of them make sense in the environment theyre set in and are complete with backstory, theyre not gratuitous "I dont like bears, plz kill 5 for me" quests. And this is an RPG, its suposed to be packed with backstory and world building, when youre sitting there talking to someone and have like 5 different stuf you can ask the guy theres no gameplay there either, but thats the nature of this genre, some ppl dont like that, thats fine but thats how RPGs goes, the quests in this game, most of the time, tell the storys dinamically at least, even if it is trough following the red trail and investigating points of interest.

Youre the first person to say The Witchers 3 quests are generic and drag the game down, in fact every review you read and most players you talk to would say the exact oposite. The treasure hunts are points of interest, CDPR didnt call any of those question marks sidequests cause they arent (to be perfectly technical witcher contracts arent sidequests either, they make a clear distinction, they are Geralt doing his professional work, secondary quests have a submenu for them thats different from the contracts submenu), they are minor activitys on the world for you to have some fun if you like this type of stuf, if you dont there are a bunch of sidequests and a mainstory quests there to keep you busy, heck just the mainstory is more content than 99% of the other games out there.

Anyway this is kinda off topic so sorry peepz, all I wanted to say is I think CDPR quest designer beeing hired by Guerilla is an awesome thing for Horizon.