Not sure why it's kick Mies around day, but any day is a good day for that, I reckon.
Mies was nevertheless a great creator, an original, whose buildings are at least forthright in their deliberate simplicity. (Please don't inform me of his infinite attention to proportion: I know.) But he and his generation seem to have pointed us down the road to an architecture that is totalitarian in its severe economy.
No one could have predicted that an inorganic, ahistorical architecture lavishly devoted to austerity and control ("proportion") would be popular among rich people, bureaucrats, and large firms.