What is the hardest game this generation?

[NJ5]

Picko said:
Sigma has to be considered more difficult than number 2, as almost everyone has said the game has been made easier and the original was awesomely difficult.

Well, even if that's the case I'd hardly call Sigma a game of this generation. And I'm not even sure that's the case.

@dtewi: You don't need to tap the controller very quickly. It's more about precision, knowing when to block attacks, tracking multiple enemies and saving health for when you need it. This series is not about button mashing.