The Napoleonic Wars DLC is very similar to Mount and Blade With Fire and Sword. The only difference is that at the end of your musket is an actual player. Its a multiplayer modification set during well the Napoleonic Wars.
+The uniforms, the guns, the gameplay, the sounds they're all good. All the fun stuff you'd expect from Mount and Blade.
+/- Online only which for me is an issue. I only really like the singleplayer experience in Mount and Blade and sadly thats not here.
Last I checked it didn't have that many players. I got to play a few rounds and it wasn't bad but its definitely not why I play Mount and Blade.