If you post your WIP here, you should expect people to find even the smallest criticism.
Thats not the problem. If someone other than halo had posted this you may well have seen the same critiques posted, they just would have been said in a nicer manner.
Its also unfortunate how all of Halo's threads degenerate into flame wars even when Josh has been pleasent - so far he hasn't said anything except to comment on the critiques mentioned.
As for my critique - I think that apart from the stairs this looks pretty good (if a little generic).
Something else that no-one has commented on is the trees. They seem rather flat to me, perhaps just some lighting being added to them would help. I don't know what CShops like with casting shadows from prefabs but that would help if it's possible.