Instruct: Classify Amazon reviews into positive or negative sentiment
Query: too implausible, story ran out of steam halfway through

The novel had too many implausibles for me to suspend disbelief. Examples: Astronomers do not outwit spies. Humans do not outwit 7.5 million year old entities whose brains operate a million times faster. The rest of the world doesn't sit around and let the U.S. conduct negotiations with an alien that can destroy all of humanity. And there is no "Hawaiian chic".The story was essentially over by page 190 (of 371). What you learn from the subsequent pages has no effect on the story's denouement. Fat books sell better than skinny books, I guess. If you're like me, by page 250 you'll be hoping for some friendly rutting among the astronomers to relieve the monotony, but your hopes will be in vain.For good Benford, try Cosm or Timescape. For good Benford with rutting politicians thrown in as a bonus, try Shiva Descending.