As I've said before:
Not all dreams are surreal and unworldly. It all depends on the dreamer and the dream itself. So it seems foolish to criticize Nolan for not making the dreams dream-like enough when "dream-like" simply means anything.
Secondly, Cobb quite frankly points out that making the dreams too unreal, to take too much control of the dream, deminishes the reality of it and is more likely to tip-off the dreamer and his projections that he wasn't in reality. Having Murphy believe he was in reality was the enitre idea of their mission. (Granted, in the third level Murphy knew he was in a dream but by that point all of the dream levels had been designed under the idea that he would believe himself in reality the whole time.)
It just seems silly to me to criticize the movie for not making the dreams "dream like enough" when, dreams are different night-to-night. Too much of the idea that all dreams have to look like a M.C. Escher painting or something.