The campaign content is ridiculously sub-par. No story elements like voice acting & music.
Hardly any new artwork... the new History section recycled old artwork from old campaigns.
I don't even care about these civs...
This was a mod before, why am I paying $10 for it?
Well the rest of what has been done is extremely appreciated for all AOE fans alike. Despite being "Forgotton" for a reason, the new civs are actually beautifully balanced. New sprites for units/buildings, new everything...
When you get past the ♥♥♥♥♥♥♥♥ effort at campaign cinematics, the campaign themselves aren't TOO bad.
Multiplayer is actually really fun now, this definitely adds a lot to multi/singleplayer Standard Games.
This will probably be almost necessary for joining strangers' multiplayer games as well.
Don't expect Conqueror's-quality expansion. This should be half its price.
If you're shy to new additions to a perfect vanilla game, you can skip it.
If you want a little more, it's okay. Not terribly necessary, but got it where it counts.