I was extremely unimpressed with Greg. He put minimal effort into preparing lectures, and we often just watched videos on YouTube, something we are all capable of doing on our own. One time, the sound didn't even work making the lecture even more useless than usual. Greg obviously knows the material-- the first two lectures on cognition and perception were actually quite interesting (and apparently he has a PhD in neuroscience?), but as a lecture he was totally unengaging and did not seem to care much about the course.