Contesting isnt useless and the examples you mentioned are outliers. I understand your frustration don't get me wrong; but I do have recorded gameplay above to back me up. I manually contested both KD and Westbrook multiple times in the 1st quarter gameplay vid. They shot 40% at best; manual contesting with right stick and turbo does make a difference.
Just like IRL these are SUPER STARS they will make tough shots. But looking at the gameplay I have, you must admit I made them missed a high amount of shots too by manual contesting.
Contesting works and is an integral part of winning; it just takes practice and recognition. Don't give up on manual contesting man, it is one of the most important defensive skills ^_^ Once again i understand though if the outlier plays piss you off, i feel that way sometimes too