Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Brilliant!

[Spoilers] The Waters of Mars is, I must say, my favorite David Tennant episode. Except possibly Blink (in the 3rd season). It is absolutely brilliant, and shows a darker side of the good Doctor. The beginning of the end of Tennant's rein of awesomeness. And the End of Time(Pt 1 and 2)... with the return of the Master, the Doctor must choose. In perfect symmetry of the 10th Doctor's character, he must give up everything for the sake of goodness. Good God Doctor, my heart bleeds for you! A bit of a tearjerker, this finale will leave Doctor Who fans breathless and stricken.