You know the really sad thing? Someone's released a parody of the game on Youtube and Eredin probably has more lines in the parody than he does in the game.There's no context for large parts of it. I mean, let's look at this forum. You have people who romanced Triss complaining about a lack of content, people who romanced Yen complaining about a lack of characterisation, people who played the previous games complaining about a lack of consequences and recognition of their choices, people complaining about the relationships in the game being under developed. What's the one thing no one complains about? Gameplay. They got that part spot on. All the complaints are directed at the writing of the game. This game, far more than The Witcher 2 ever did, is crying out for an Enhanced Edition that fills in a lot of the gaps.
I didn't really think that Yennefer lacked characterization; I'm not sure what that complaint is about. Lack of Triss stuff and Eredin monologues is simply how the game is written, and I don't think it's somehow broken. Ideally, it would have been cool to see more of Dandelion, Zoltan and Triss, since they have been there in all three games and are three of Geralt's closest friends, but I don't think it somehow spoils or flaws the game. There was obviously a conscious decision made to introduce more characters instead of giving more screen time to the returning characters, and while a lot of players are not thrilled with that, it is simply the choice that they made.
I'd agree though, that tossing out every decision the player made in the first two games was pretty crummy, and it's probably my biggest complaint about the game, other than the fact that I finished it and it's over. There are some things about Act 3 that genuinely seem rushed (Reason of State, the Tower end sequence, the Lodge), but strangely enough those don't seem to be the main complaints.