Make sure you have a northern area in your campaign world where a bog or swamp makes sense to fit this adventure in.
LIKED: The history is complete enough to provide motivations for most of the NPCs, but generic enough to fit into any standard fantasy world. The encounters are not amazingly imaginative but still a lot of fun.
DISLIKED: Solid, but a few holes will need to be filled in by the DM. This is really no problem for DMs accustomed to fitting published modules into their campaigns. There are a couple of unique magic items each DM will have to weigh whether it will imbalance an individual campaign or not.