That's just ridiculous. His trilogy is good, in the vein of Asimov. It's riddled with issues, yes - such as poor characters, unbelievable human behavior, etc. But the big ideas (which is what a lot of the people reading science fiction are after) are very cool and fairly novel. Come to think of it a lot of this could be said about Asimov or Arthur C. Clarke. Their characters sucked too, yet their books are classics.

You know, Cixin won the Hugo award? This fact alone should tell you that he cannot be the worst, not even close. A lot of people enjoyed his novels. You could argue that he's over rated and that's about that.