So many people? I don't see these hordes of people beating at the walls of these forum going on about the ending of dai. Most people are fine with the ending. And yes they were. Every bioware rpg has the climax of the story as a choice. Every last on of them. The well of Sorrows was that climax.
I agree with a lot of what you're saying, but I think it's important to make the distinction that a climax can be many things, and in fact, a game or movie may have multiple climaxes done well.
An action oriented climax would be the high point of the action, but an emotionally driven climax may occur before or after the height of the physical action based on a characters death or even a tragedy that affects a characters life like the loss of a relative or a loved one, or something along those lines.
But all climaxes must have some form of conflict.
I think choosing to drink from the well or not is the climax of the arbor wilds, and the arbor wilds themselves serve as the rising action leading up to the physical confrontation with Corypheus, the revelation with Flemeth being the emotional climax of the game in regards to finding out you're a slave to a dead elven god or Morrigan is enslaved to the will of the person she spent her whole life trying to break free of, with the final boss battle being a climax of the physical threat.