I find the best way to describe Thom Mayne's approach is "contrived complexity." But this is not his invention. He's merely practicing his own variety of the architectural fashion du jour: a hyper-self-aware, hyper-indulgent, computer generated mutation of Post-Modernism that substitutes ornament with artificial busyness of form. It is Modern Rococo. Most of the world's current top-tier architects subscribe to this approach, though, each tries to add their own signature flavor, whether it be undulating blobs, acute angles, biomorphism, or Mayne's hi-tech-industrial theatricality.
I actually like much of this architecture, including a lot of Mayne's buildings. But I find the decadent excess of this architecture completely unjustifiable. Seen merely as artistic expressions, these buildings can be very interesting, but seen as buildings they leave me unsatisfied too often. They try too hard. They are too affected, too self-conscious, too artificial. They do not grow naturally -- out of their purpose, environment, or some major new development in building construction (I dont count CAD modeling). The stuff is simply too phony to be taken seriously.