These things are a total waste of everyone's afternoon, they really are. Even if they aren't about technical or musical skill, I don't even think they could claim it's about influence either. If it were, how could they justify Jack White rating higher than, say, Tony Iommi?
Anyway, the whole thing means dick all to me, because Joe Satriani isn't on it, and if it weren't for him, I'd never have picked the instrument up in the first place.