Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Where did Larry Niven go?

Larry Niven is one of my favorite authors. However, I'm beginning to wonder if space aliens have kidnapped the real Niven and replaced him with a robot. A robot with few, if any, of the real Niven's writing skills.The orginal "Ringworld" is wonderful, and "The Ringworld Engineers" is a more than worthy sequel. "The Ringworld Throne", however, is a major disappointment. How could this have possibly been written by the same author?I read this shortly after having read "Beowulf's Children" and I was equally as disappointed with that book. The original in that series, "The Legacy of Heorot" was top-notch Niven. "Beowulf's Children" didn't seem as if it could have possibly come from the same pen.Which brings me back to my original point. Space aliens, what have you done with our Larry Niven and when are you going to bring him back?