I really like the Tau being evil being even in the lore, they're not often seen this way by common imperial troops (at least the less brainwashed ones). Its lik

I really like the Tau being evil being even in the lore, they're not often seen this way by common imperial troops (at least the less brainwashed ones). Its like every faction has a special ability, and for Tau its fantastic PR. Strange as it sounds, imo the least evil faction is the Tyranids. Though they're (or I guess technically it, because they don't have individual minds) intelligent, its an entirely different form of intelligence which makes them more like a force of nature, no more evil than a tornado is.