I have a lot of time for people slagging off Adam, as his limitations are obvious and he's not so young that we can expect him to improve. I will listen to people moan about Carroll; he's a bit younger, but again, his limitations are evident.
I will, however, defend Henderson, for the same reason I defended Lucas about 3 years ago when he was facing many of the same criticisms. He's not a world-class player, and to be honest, I doubt that he ever will be. However, it is clear that inside him, somewhere, is a very good player. He's still quite young, though he does have quite a bit of experience at the top level already, and I think in two or three years he can be a first XI player for a side that wins the league. He's not perfect, and we're going to suffer through some growing pains as he learns, but I think he'll come good. Vision, skill in tight areas, knowing how to weight a pass - these are the qualities that, once his rough edges are worn down a bit (and he's played in the middle a bit more!) will lead us to really appreciate Henderson in red in a few years.