It's hard to say how Harry won. But least he didn't have a weak will and fall to corruption like Frodo did with the Ring.
In full honestly..I sided with Voldemort. Harry hid behind powerful wizards...
Well better Voldemort and his goons over Sauron and his Orcs.
Well...the orcs I never took seriosuly...I mean compared to the orcs from the hobbit
Isn't that how a lot of heroes win? By pure luck