Damn I hate it when Kishi impresses me. I'm sorry, but this Madara is a Madara I actually like, a little goofy, but still a Shinobi. Much better than the smug asshole we've always seen up to now. And this flashback is perfectly paced, IMO. Come on, the warring periods have been discussed, but showing the carnage, the loss of siblings, the inability to even tell someone your name for fear of being killed because of it.
I think it's a necessary contrast to show Sasuke, and us the reader, the real difference there is between the warring period and the times of peace we're more accustomed to. Hell, by comparison of what has been shown, the 3rd Shinobi war wasn't so bad.
One Piece! Hell Yeah!