Sometimes a well thought out plan of attack, does not pay off in the end
V is almost the exact same character as Robin Hood and is most assuredly Good. His quest is the liberation of the people from Tyranny. The horrid past is what he has to transcend to get there. He merely lives in a more desparate world than Robin Hood is usually portrayed in.
Someone never read the comics. V was Neutral Evil, taking revenge on a world that had hurt him by striking at the face of his pain - the government that had destroyed him as a person. You could make a solid case for Chaotic Evil, but he was far too methodical in, well...He was quite creative in how he destroyed the various people he targeted, too... To the point where anything but the vaguest descriptions here would make some parents very angry. Robin of Loxley was Lawful Good - he stayed true to King and Country, and his own principles of fairness and proper care of the lesser class (that is to say, they'll keep working for you if they aren't starving to death), even in the face of an illegitimate successor to the throne. The Good part is negotiable, if we want to consider that he was indeed a feudal landowner in middle-ages England, but we can handwave that and stick to the fairy tales.