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Everything you've added so far to the game is a big improvement: shooting and reloading animations, uniforms, horses, weapons, shaders, new map, and so on. Unfortunately every Native thing now stands out quite a bit, in a bad way: ugly simplistic trees, apparent sliding during running animation, very sparse grass, geometry and textures of heads and hands of troops. It would be terrific if all of that matched your works in quality.
Trailer in itself is good but not great. There are some outstanding shots (slo-mo cavalry charge accompanied by brilliant music) but I don't really like editing and script. Took me way too long to realize it is supposed to be one battle. Those black screens with text - we want to look at your amazing models and textures, not on pitch black chasm. Why not put texts on video material? Also, video could be more relevant to what's on these texts. "Unmatched historical accuracy" - you show horses stopping suddenly after charging in ridiculous M&B way; "hundreds of accurate weapons and uniforms" - you show two kinds of troops and few weapons; "massive map of Europe" - you show German cavalry.
That said, the mod is already looking very impressive!
The mod is totally worth the price of Warband!
Duchy of Warsaw was a Napoleon's puppet state.