So late-middle ages based FPS? Does it have good singleplayer? I'm not looking into multiplayer that much. How about the DLC "Napoleonic Wars"? It's listed as not having singleplayer, but it's gunpowder era which is really cool and I hate multiplayer without friends :(
Realistic-ish FPS/RPG hybrid.
I only play Singleplayer all the time and have a blast (The first game was SP-only so it's pretty well done).
Last I heard the DLC is MP only though, Although the third (Fire & Sword) has gunpowder weapons in it and supports SP. Though people claim it's the worst (I thought it was okay).
It's one of my top ten favorite indie games.
It's also got lots of cool mods (Albeit most MP-focused). From A Napoleon-age warfare mod, to Lord of The Rings and Star Wars.