I have a very special attachment to the Midnight setting. Except for some editorial choices, which you can like or not, the book is faithful to the original editions. The descriptions are very correct and this is a big book that depicts this desolated world with a lot of details and pretty fine artwork.

Unfortunately, I cannot play the game with the ruleset as given, as the work here to adapt to 5e cannot compete with the care that was invested into the latest editions with 3e D&D. As written, these rules does not manage to serve the specific feel of the setting and the uniqueness of light bearers. This is too bad : A few optionnal and costly feats cannot emulate the greatness of the heroic paths.

The book can be a base to work your own game upon, but system-wise you will have : to houserule the heroic path feats allocation, to create the half-races that are missing (all of them), to pehaps balance some of the new races that are proposed, to find the class archetypes elsewhere to emulate the feel of the game and some missing classes (as the defender), to create your rules to make spellcasting feel more dangerous and different, to make Midnight-specific weapons not just new names for the basic weapons from the 5e player handbook, etc. etc. I you do not do some of that, your Midnight characters can be not so much different than any other forgotten realms adventurers. Then it might constantly cost a lot of energy to keep the mood and themes of this setting on track.

This book is a wonderful experience at shyly giving 5e a Midnight flavour, but it's not Midnight boldly twisting 5e to its own whims and desperate reality. Too shy, too lazy or with no passion for the ruleset? By the end, the product is not a complete failure for sure but it's disapointing. At least because I love the Midnight setting and 5e so much and I think that the synergy can be great.