well, i'll tell you that i actually do own a very large sword, it's full length is 56 inches (almost 6 ft) and is also quite heavy, i'm about 6'4" myself so i'm pretty much the only person in my house that could possibly think of weilding it, however i have swung it around in the open in my backyard (i gotta wonder what my neighbors thought that day) and i'd have to say that if i was to go into a battle with that weapon, i would use only if one of two circumstances were fulfilled either a) my opponent was on a horse, in which case i'd probably use the sword to knock the horse down then trash the rider, or if it was my pre-emptive strike and i had an other lighter weapon handy, in which case i'd probably take my opponent down with the first blow, but the second weapon would be just to cover my butt
but yeah, you could definitely use a large weapon like that if you knew what you were doing with it, so don't knock it if it works