This is a very well written module. It is my favorite, second only to Crown of the Kobold King. It has nice artwork, there are a lot of interesting encounters, and a free structure that lets the players pick their own path. Cool.
Also a good way to give players a base for further adventure, as they may end up owning part of the land in the vale.
James L. Sutter did an admirable job piecing the various rooms made by the Paizo staff into an almost coherent dungeon. However, that said, this is far too much deathtrap dungeon for me. While this may be fun at a convention, as a "who dares to test their mettle on this...". It just isn't much use for me in a regular campaign. Maybe I can use it as a oneshot, or pick the neat parts and reuse elsewhere. Hmmm.
As someone else pointed out, the artwork is gorgeous!
I liked this module the best so far (I got Conquest of Bloodsworn Vale and Sevens Swords of Sin as well as Burnt Offerings).
Good artwork, excellent layout, cool monsters, gripping story... yeah it's good stuff! Keep it coming.
I like the content. It's cool stuff, with plenty of background material, that really brings the villains, places etc. to life.
In fact the whole thing would have gotten a much higher rating from me if not for two things.
The interior art is of varying quality. It may be chalked up to personal taste, but I really dislike the chunky style (p. 19 & 23 for example) by one of the artists, and the weirdly colored stuff (p. 12 & 29). The maps and other illustrations are fine! (or more than fine actually).
Finally there is the font. I see other people here mocking those, who find the font too small (check your prescription etc.). No, there is nothing wrong with our eyes! The font setting is too small. I really hope you fix this for the next books.
Looking forward for the rest of the series.