Just bought the digital download a few days ago and, so far, it looks great. The artwork is solid, the flavor text and lore enriching and immerse, and the setting grim and unforgiving. It does a very good job at making each character, though not too many characters to have the problem of "class-cloning", but each one feels completely different from the rest. I liked the introduction of more social and support classes such as the merchant or midwife; character archetypes that have been breezed over in the past.
The storytelling and a true commitment to roleplaying seem to be essential in playing the game to its full potential. The idea of playing an Apothecary and being told by the DM, "Your friend has just been bitten by an infected... Unless you amputate his arm immediately, he will die and become a zombie" is quite a daunting task, along with countless other horrible fates worse than death. The social setting revolves around moral choices and dialogue, rather than slaying mighty dragons with cosmic thunder punches.
The mechanics are very well fleshed out using the widely-used D20 system for combat, however it seems like this game's selling point is its atmosphere. Ultimately, its power lies with the imagination of the players, not the numbers on a die. I recommend the Darkest Age to anyone who might be looking for a mature horror style campaign.
[4 of 5 Stars!]