Ok people, enough is enough.
The point of this thread isn't if Rinnengan or Sharingan is better.
The point is what qualifiys as a "real villian".
My opinion. Pain was not a "real villian". Before anyone starts flaming, let me explain.
The only reason I say this is because of his motives. Overall, he wanted peace. This was just the only way he came up with to get there. In the end, his mind was changed by Naruto, making him basically good at his core. It was an "End justifies the means" situation with Pain. Had his objective not been peace, if it were destruction, domination, or any other completely selfish purpose, Pain would've made a great "real villian".
As well, I do not consider either Sasuke or Kabuto a "real villian".
I'll start with Kabuto.
While yes, he is apparently "evil" he's not much on his own. He's inferior to Orochimaru, and does'nt do much without Oro's orders, making Orochimaru the "real villian" of that team. Now, if Kabuto steps it up a bit in his next appearance my opinion may change, however with the skill levels we have seen from him....hes no real threat to most main characters. Therefore not qualifiying as a "real villian".
Now on to Sasuke. I realize that this topic is highly controversial and my opinion does not follow the crowd on this one, so please do not feel the need to flame my opinion. I know many disagree.
In my opinion, I don't think Sasuke is even a "villian" at all. I believe he is and always was a "good guy". I've not see anything in the manga so far to prove he is a villian.
I believe that yes he did want his revenge on Itachi (I don't think anyone disagrees on that), but I believe that everything he did up to the point where he killed Itachi was to both, help him achieve that goal, and help Konoha.
I think Sasuke was doing basically the same thing as Itachi from the time he left the village. Everything he did was to help Konoha. Think about it....
1) He knows he is wanted by Orochimaru (the biggest threat to Konoha at that time) so he goes with him. This gives him the opportunity to both gain enough power to kill Itachi, and take out an enemy of Konoha (Orochimaru)
2) Then he continues on to kill Itachi, getting his revenge and again, taking out yet another (assumed) enemy of Konoha.
3) After that, he is taken by Tobi. I believe that his reactions to the truth behind Itachi show that he was doing the same thing. He was that upset because he killed someone doing the exact same thing he was doing, and, it was his brother.
4) He is then wanted by Tobi (A member of Akatsuki, and thereby an enemy of Konoha). So he goes along with this act as well, infiltrating Akatsuki and waiting for an opportunity to turn on Tobi and any other remaining Akatsuki members.
5) As for him going to "destroy Konoha" now, he's really going after the elders, who ordered the attack on the Uchihas, so he yet again wants revenge, for good reason. But in taking out the elders, he'll take out Danzou, who is plotting the takeover of Konoha...which makes Danzou also an enemy of Konoha.
So far he has not done much to be considered a "villian".
I know one of replies people will come up with is "OMG WTF, are you serious!!! LOL, Sasuke's not a villian!!?? He tried to kill Naruto multiple times"
So I'll address this now as well.
I do think that during the fight at the valley of the end Sasuke was trying to kill Naruto....up to the point where he falcon dropped him and really thought he was dead. I think once he had thought Naruto was dead he had horrible guilt (by his reaction). Then, once he saw Naruto was alive, and FINALLY found out that Naruto is the 9-tails host, he knew he had to continue the fight at that point, but no longer wanted to kill Naruto. He just wanted to beat him so he could get away and continue trying to help Konoha from inside the enemies organizations. (Hence why he did not kill Naruto after the curse-mark chidori VS. fox-power rasengan)
After that moment, he no longer had to worry about anything he did to Naruto because he knew the fox would protect him. So he put on the show of trying to kill Naruto at Oro's hideout, to keep Oro's trust.
I think I've said enough for now lol, if you disagree please do so respectfully.