The Starks VS Voldemort
Ok, so this is probably somewhat of a weird thread, and I have no idea if it will even get responses, but a few days ago a friend and I were watching old Supernatural episodes. One of them featured a pair of witches, and said friend, who is a Potter fan, remarked that they would lose to any skilled Potterverse wizard.
Here are the Starks, showing a bit of what they can do:
YouTube video
YouTube video
YouTube video
Maggie also uses hex coins to warp reality and kill people Final Destination style, and at the end of the episode Don causally drops a leviathan (beings who can shrug off even angel magic) with a paralyze spell. The most telling thing about their power level is the fact that the sheer backwash from their animosity directed at each other was affecting their entire town, causing bad luck, weird weather, crop failures etc.
Now I personally think that the moment the fight starts Don makes Voldemort swallow a swarm of insects while Maggie rips his head in half, but my friend insists Voldemort will beat them (though he doesn't say how, just that Voldemort will figure out a way with all the spells he has). Admittedly, I despise the Potterverse and enjoy Supernatural, and might not be objective, so thought I'd get more input from people here.