No, most of the criticism comes from the fact, that he has a super high ego, thinking he is always the smartest person in the room, making him treat others badly. See the comments from people working for him. And his big ideas - well, he claims he found the holy grail of physics, the theory of everything. And he wrote a bestseller for the masses. But actual physicists are not convinced because his model is simply worse at predicting data of experiments, than other models (which do not claim to be theories of everything). And he reacts poorly to this criticism.

So yes, he is smart and a interesting character. But maybe not one who solved the theory of everything. Because if he really would have - then the results would speak for itself. So I am not ruling out that his approach can one day lead towards it (not my area of expertize) - but apparently he is not there, but claims he is.