Roger Ebert said it was due to a Film Critic seeing 2-3 movies a Day. If you are seeing that many movies, you start to yearn for something different and challanging. If you see at most 1-3 movies a month on a good month, you tend to be ok with "just" entertaining movies. Also critics like to see movies that move the artform forward in some way. So while Bright on Netflix is a very servicable by the numbers movie, it is not really doing anything outside the box.