Originally a mod for Age of Empires II: Conquerors, The Forgotten adds new units, civilizations, game modes and more. It's a rather unique situation, as the original game - Age of Empires II - was released nearly 15 years ago, getting an official DLC so many years later. Microsoft and Skybox Labs hired the original team behind the Forgotten mod to work on this addon which can be interpreted differently. I see that as Microsoft willing to give us as much of an addon they can, this late down the line.
Looking from a fair perspective, this content pack does not add That much. A lot of people will consider the content sparse for it's price tag of 9€/$10, but I am personally blinded by my love for the original game and the very idea of getting to play new content for a 15 year old game. That does sadly make this review more of a fan's input, rather than an honest and neutral review. To be fair though, if you originally bought AOE2HD - a pretty niche title - you should already know what to expect out of this DLC. (Review of AOE2HD
The main addition are the 5 Civilizations; Italians, Indians, Slavs, Magyars and Incas. They cover some pretty interesting historical and geographical locations that can easily be related with the exisiting civilizations. All with new unique units, building textures and strength/weaknesses towards other civilizations. The textures look very similar to that of the originals, and you will have a hard time figuring out this was originally a mod. Everything is very well polished overall, something I was personally a bit afraid of before playing it.
Only downside would be the Campaigns that did not capture me that well. Honestly the original campaigns probably would not either if it was not for the nostaliga playing them. They are much more advanced than the original campaign, since the modders have gathered techniques over the years. All the maps are much more compact and detailed, and they take much longer to complete. They are often more about 1 unit/hero making it through the map rather than base-building and army-training.If you Love Age of Empires II, intrigued by the thought of 5 new Civilizations to play with online, or on LANs, this is an excellent addon. Not so much if you are a single-player only and were looking for just the campaign.