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While I do appreciate the most popular mods like UA and Unification, there really is something to be said for the approach of Redux mod, which simply polishes every single aspect of the vanilla game rather than bloating the game with an enormous number of units and factions.
Fantastic! This mod doesn't just add more stuff (but it sure does that as well), it completely revamps gameplay in a really well-designed way that rewards map control while also allowing some defensive play. All the screenshots and videos of the mod speaks for the amount of content that you'll find, but you really have to try it out to experience the gameplay! The mod also still has a somewhat active online community.