It's the internet age, the age of connectedness. Ask Sony or Microsoft about the defining feature of their next-gen consoles, and they'll start telling you about "social," about playing together online, all the time. That's all well and good, but does every game need online multiplayer?
Two samurai, two swords,
three six bullets. No power-ups or special characters are necessary to make Samurai Gunn one of the best fighting games I've ever played.