A villain is usually defined by those around him. Often this label is placed by those who do not agree with his/her actions. I disagree with the title superheroes and I feel that they are just as much villains as the villains they combat.
Think about the damage done by the Hulk tossing his opponent into a building. Now people live in that building (Real estate is expensive) and now their residence is no more. Where do these people go? Suddenly we have homeless individuals by the hundreds showing up because a Super couldn't control himself and find some other means to detain an individual doing worse wrongs.
So if you had not been effected by the villain doing epic battle with the hero, and suddenly your building is demolished by the hero. How would you make the call, the lesser of two evils?
Changing directions. I see no problem with playing the opposition. Tastefully done, it adds dynamic events and character to a game. However, a jerk is still a jerk, whether you call him a villain or not.
I would play a villain, no problem. Although I prefer "Grey" characters or antiheroes. There is a saying from Batman "You either die a hero, or you live long enough to see yourself become the villain", which is true.
Hmmm, maybe I will do such a character in my next Dungeons & Dragons campaign.
Faction and Reputation. In some games "Grinding" faction to build up one's reputation, not even certain you could erase completely the negative impression others have of the villain.
If the villain does not reveal himself and exists beneath the surface of the game, does that count as favorable reputation?
I'm a Dungeon Master. I play villains all the time.
As a player, I enjoy playing characters that explore morality and are faced with hard choices. I've fallen, found redemption, and sacrificed a character's honor for the greater good.
I don't often play PCs who are unrepentantly evil. They typically have solid reasons for their villainy and I find cartoonish mustache twirling villainy dull.
False. That's a simplistic view of villainy.
Magneto is a villain because of the means he's willing to employ to strengthen and protect his species.
The Operative from Serenity was a villain doing what needed to be done to protect the central government.
Villains can absolutely have noble motives and the very best villains often do.