For me, the best thing of Iron Europe is certainly its community. Without supporters motivating us, update after update, Iron Europe would have died off like hundreds of mods before it did, coming to be the most promising mod for Napoleonic Wars. My point of view is certainly biased, being a developer, yet unfortunately i dont see any other concrete mod for NW coming out in the near future.
Talking of in-game stuff i love it how OP fixed Machine Guns are
EDIT: Or maybe the new admin weapons?