It is that good! Basically it's the best WotC adventure is several years.
In quick summary it has a coherent plot, lots of high adventure, many different environments (examples elven forest in a swamp, undead temple in a desert scrub-land, city street fighting, etc.) and many different challenges (combat, diplomacy, research).
Basically it seems to me to hit all the marks that I want in a published adventure.
Also WotC was nice enough to publish a compiled set of stat blocks on their website which makes it even easier to run!