Shotgun implies blindly scattering a million little bits of junk all over a problem, like the pellets in a shotgun shell; hopefully one little bit hits the mark. It's trying stuff until something works, rather then understanding what's going on.
Voodoo implies doing something because of magical beliefs, or more specifically, doing something for an unknown reason, especially something overly complicated: "I've always done it this way, I don't know why it works."
Neither characterization is flattering: they imply ignorance and incompetence.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…