While I understand that people are somewhat upset over the ending, as I was originally, there really is meaning to it. If we consider DE:HR to be a story driven game, that is.
At first I was kind of disappointed, why is there no conclusion, why is it just push a button and receive and ending, why couldn't it be a reflection of my actions?
But if I may, the ending is supposed to be the way it is, it isn't lazy writing. The entire concept is that the power of only a small few dictate how humanity will continue to exist, how much power they have over the world, how fast they can direct our thoughts through the media which is easily manipulated by them. Each ending was plausible with Adam's explanation, as well.
No conclusion with Adam or his friends is on the same level. The point of the game is about humanity and technology. It isn't about Adam, Pritchard, Megan, Sarif, or any specific person. If they made it more personal, the viewer would lose any worldly meaning.
But that's just how I feel about it.