While I'm not a fan of Pat Lee as a human being his art was decent enough. Not the best of the IDW artists but still very solid. I had serious issues with his storytelling too as always think of that sequence between Superion and Devastator and how poorly it was thought out.

That said, you have to give him credit. He took the TF licence and was instrumental in the franchise's success as a comic series. All of his series and issues averaged around the 60K mark. The current comics don't even come close to that. I think he's an abominal human being and have nothing but contempt for him but I think that allegations that are constantly made against him that he cannot draw or is a pathetic artist are unfounded and fail to objectively view his contribution.

It's all relative as to who is a good artist and a bad artist. Different artists have different styles too and that means that one style might appeal to you and another may not. If at least 60K worth of fans warmed to him once upon time and Marvel Comics and DC comics, and Image Comics hired him he can't be a clueless hack. There's a difference between not liking a person and objectively viewing a person's achievements and I feel that that distinction by many fans cannot be made.