@Megadoomer:
One question that came to mind - why is Madara evil? I just realized that, even though we've had two extremely long flashbacks which focused on him, I can't recall any sort of explanation for that.
Even Obito has some sort of reason, even if it's a horrible one, but for Madara, I'm not sure why he's doing all of this. It's not because he didn't get to control Konoha, since he ruined his own chances for that by openly sabotaging peace talks that he was supposed to lead, which wouldn't exactly make him come across as a good diplomat, and it's not because the Uchiha were marginalized, since that happened during the time of the Second Hokage, which was after he supposedly died. I don't think it was even because his brother died, since he seemed to waste no time in gouging out his brother's eye to get more power.
I'd rather not reread this train wreck of a war to get an answer for this (it was painful enough the first time around, and I'd have to go back a ludicrous amount of chapters to get the answer), but if anyone recalls why that's the case, that would be great. Normally, I'm not too concerned with the reasons why villains do what they do (if they even get an explanation, it's either nowhere near enough to justify their actions or ridiculously over-the-top in most cases), but given how much time we've already spent on Madara's past, you'd think that a reason would be given somewhere.
It's pretty straightforward. Madara and Hashirama saw things in a very similar way: the eternal warring with cycles of paranoia and vengeance that defined their lives should come to an end. And they made this happen. But while Hashirama was content with having made the Leaf, and aimed to create a balance of power that would keep peace. Madara was probably pushed by not being Hokage, but really it was he realised (or thought) that the solution was imperfect. In practice, a balance would never hold and peace would never come about just because humans are flawed and prone to warring over all sorts of reasons. This, in time, led him to construct his master plan of putting everyone into an illusion where there was peace under his control. And so there would be no more war. And everyone would be happy.
Why he attacks the Leaf repeatedly is a little bit more mysterious. Perhaps he was in part trying to show Hashirama that his method was flawed: that there would be rogue factions like Madara through all time who would be dissatisfied and would cause more pain and suffering. Alternatively, we know Madara personally enjoys combat, so perhaps he just really wanted to fight (and kill) the man he'd fought so many times before. Maybe some combination of the two.
We know Madara was right, of course. There have been three great ninja wars. And they have clearly had horrible human cost both during and after. See things like the fiasco with Neji's father … or the death of Tsunade's brother ... or any of the many battlefield casualties, implied or otherwise, that we've seen. The balance of power didn't work. And that failure created the likes of Pain and Akatsuki. Granted Madara gave Nagato the power to do what he did, and he planted ideas and did his subtle influencing, but it's clear that something like that would have come about even if he hadn't ...
PII of Naruto has essentially, at it's core, been about this. Kishimoto meandered for, well, quite a while, but this was the whole deal about trying to find a way for peace. Jiraiya struggled and couldn't do it, and he passed the torch on to Naruto. Nagato thought he had a way, but was being pulled along by Madara the whole time, and in the end gave in to Naruto's stubborn determination that "It'll work out somehow." Now Madara (and formerly Obito) are trying to do the same, and once again, the protagonists are standing against with "Yeah, you're right, but I'd rather stubbornly try and make it work out somehow than live in a fake world where I don't have real choices with real impact."
To digress a little, it's an interesting - if entirely unoriginal - theme. It hasn't been played amazingly well, and it's been choked by a bloated war and worse, a bloated battle. And Sasuke's unimpressive silence (but that's the whole of PII really). But it's a nice core to the close of the series - Madara's motivations are compelling, even if Kishimoto does his best to obscure them. Naruto's motivations to oppose him are again quite compelling, and very typical of Naruto, even if they don't get proper focus. And Sasuke's motivations being basically in line with Naruto's but for far more complex and much more recent reasons would be compelling, if Kishimoto would give him a speech bubble with something other than elipses, functional dialogue or "I want to be Hokage."
tl;dr:
@MajinArekkusu:
Wasn't he thinking that the world can't be changed and that there will always be wars, thus he wants to slave the entire world and put them into the matrix?