Because it gets me, that's why.
To be specific, this is from a tutorial sreen for Mount & Blade: Warband's Napoleonic expansion, which has all the tea, flutes and muskets you could ever want in a multiplayer shooter.
Here's the recently-released expansion's trailer. It's as fun as it looks. Provided you can stomach the reload times.
DISCUSSION
Because it's freaking amazing, has a great modding community, and proves that graphics aren't anywhere near as important as the quality of the gameplay?