After playing Amnesia, is Penumbra any good?

[CD Set]

Well I do like both, and while Amnesia is arguably scarier, the Penumbra series had the better setting in my opinion.

While I wasn't super-fond of Overture, it's worth playing just so you can experience Black Plague, which is by far the best installment. Requiem is a completely different experience (and doesn't really drive the story forward in any way), but should still be played for completion (and interesting puzzles) alone.