Instruct: Classify a review into positive or negative sentiment.
Query: Science fiction adventure classics

I have read the trilogy three times. "Deathworld" is about a planet literally at war with its settlers, a race of supermen. Jason din Alt, a smart-aleck gambler, becomes embroiled in their cause against his will. "Deathworld 2"--din Alt is marooned on a backward planet of slavery, steam engines, and flintlock rifles. "Deathworld 3" is one of the most exciting. The protagonists of the original "Deathworld" decide to colonize a planet run by conquerors reminiscent of the Mongol hordes, complete with their own Genghis Khan leading them. Jason din Alt has to infiltrate the horde. All 3 books are very exciting reads!