Critical feedback (suck it up)
Combat:
Outrageously bad enemy design, questionable balance and sword hits that make the enemies feel like butter overshadow the improvements (them being the responsiveness and the small dodge). Leveling system is weird, why is the last perk in Defense has to do with instant-kill? Why is Rend not nearly as good as Whirl and not even as good as a normal Strong Attack? What's the deal with Adrenaline Points, how can keep track of their generation? Why almost none of the alchemy perks have to do with upgrading the individual potions buffs and rather a random buff? It seems as if CDPR were eager to make more perks in the expense of more variety, relevance and balance.
Oh, and the hitboxes. They're horrible
Crafting and Loot:
Item crafting has vastly improved no doubt. The complex items and crafting components are great additions and feel like an important step forward. Alchemy however, took five steps backwards: Unlike TW1&2, potions, bombs and oils crafting in TW3 doesn't have to do with harvesting components, rather it became a tedious exercise in going to a store, pining the crafting formula and hoping the herbalist has the components. The amount of oils, potions and bombs was reduced as well.
Loot is just bad: you can't make an open world full of loot if the player is only uses two swords and armor. finding stuff isn't not as exciting as it was in the last games, much because the Witcher sets completely ruin the balance, no reason whatsoever to look for loot if you have a god Witcher set.
Area Design:
Not as good as the previous games. Can't think of an area as beautifully and carefully as Flotsam, Loc Muinne and Lakeside. It's a result of choosing to make the game an open world, but still, damn shame.
Story:
Complete disappointment. I was expecting something at least as good as the last two games (CDPR thought so it seems) but refused to believe the game was written by the same team. Plot holes, pacing issues (god, the Novigrad act) uninteresting characters everywhere, this Deus Ex Machina in the end, TW3 is guilty of all this charges and a terribly lot more. A side from the Family Matters quest there's not one plot arc even remotely in the quality of the previous games (and I do mean not one - the Whispering Hillock was the weirdest, out-of-the-blue moment in the game maybe).
Side Open World Activities:
Gwent's awesome.
Save Imports:
The absolute worst offender. The Witcher 3 often ignores the last games plot, sometimes apologizes for it and sometimes even straight out contradicts them. In TW2 you made kingdoms rise and fall, but if you ask The Witcher 3, they all fall. The choices you make in TW2 don't interest TW3, because it's so eager to tell its own story. This retroactively makes TW2 a bad RPG - your choices don't matter: Spared Stennis? Aedirn falls anyway. Spared Saskia? Don't mind it, Philipa lost control over her in any case. Neglected to help Roche rescue Anais so in the ending he went on an exile with her? Errmm.... No.
And why are the characters so different then in TW2? Letho apparently was stupid to believe Emyhr will honor they're deal, Radovid is now a complete lunatic asshole, Triss has lost any and all remnants of sexiness and edge. What were you thinking CDPR?
Quests:
No variety, no challenge other than killing monster and almost no interesting story. This Detective Mode ripoff has cleaned the quest designers of all inspiration apparently. Simply press the Witcher Sense button and follow the footsteps/scent/blood/whatever. Where's the unguided exploration of the Rotfiends Contract (or any contract really)? Where's the puzzles of the Secrets of Loc Muinne? Where's the re-activity of Death Symbolized?
Conclusion:
Quite disappointing...