It seems that most of the criticism seems to simply be the fact that Will Smith is blue, which, as you might recall, was the problem that everybody had with the first look at Will Smith in the role, because he wasn’t blue. At the time, Will Smith took to social media himself to put everybody at ease and promise that he would be blue in the film. Now, he’s followed through on that, and people are still freaking out.
Article source: https://www.cinemablend.com/news/2466745/wait-what-did-you-think-will-smiths-live-action-genie-was-going-to-look-like