there seems to be always a hate for new things. from the sociological point of view, that's pretty normal in every society.
horse-shoe shaped stadiums, or probably now also known as toilet bowl cover, is not new a design. this kind of shape is particularly popular for stadiums built for american football (rugby.) however the proposal stated that the shape is designed with consideration for ventilation and view (whether they are that important depends on how the judging panel prioritizes, one also needs to see detailed report to know if it really works)
for now, just have to wait and see the other proposals.