Parable of the Talents was not quite as good as Parable of the Sower. But (1) Parable of the Sower is my favorite SF novel of all time, and (2) I still read Talents in a single day, and it is not short. So take my opinion with a mountain of salt.
Reasons I'm not quite as impressed with it as with its predecessor:
(1) The voice is just not quite as poetic.
(2) The main character is not nearly as dynamic, i.e. she doesn't change much (which makes sense as the first novel was a coming-of-age story, but still).
(3) While the main protagonists and antagonists are multi-dimensional and nuanced, the true villains are rather cartoonish.
It's still a book I'd recommend and one I enjoyed very much, and it provided a solid resolution for the setup at the end of the preceding novel. It's just not a masterpiece like its predecessor was.