Since we know now that Namco is listening to us I think this is something we should talk about so they get an idea of what we're interested in for the next game. Anyway for me the Weapon Master mode in 2 was the best and I want to see something similar in 6. The single player missions should have different challenges you need to overcome like defeating your opponent while you're poisoned, win by knocking the enemy off the stage and stuff like that. There should be unlockable characters, weapons (with weapon effects) and stages also. These things gave the earlier games longevity after everyone had moved on from the multiplayer and they offer unique experiences that you can't get anywhere else.