Funnily, real bastard swords were more often used as shock weapons and considered too cumbersome to constantly wield. Sometimes they didn't even care to sharpen them. It was like a hammer, just to crush the hell out of an opponent in armor. Then they'd take out a small axe and start swinging away.
But.. I love the concept anyways. What gets me is that there aren't many unique 2h swords. Seems like mainly axes and hammers at the higher end.
This is a widespread and demonstrably false myth.
Refer to:
http://thearma.org/essays/2HGS.html
http://www.youtube.com/watch?v=tsGU5KI1qJA
It's the same misunderstanding that leads people to think medieval knights needed cranes and whatnot to get on horses. (FYI, this myth was the result of a poem written long after plate armor was actually used)
http://www.youtube.com/watch?v=xm11yAXeegg
On sharpening: many longswords and zweihanders had a portion of the blade close to the hilt that was left unsharpened. However, this wasn't because the weapon was meant to be used for blunt-force trauma, it was because swordsmen would use that part as an auxiliary grip. This was a technique called half-swording, and it was developed in order to counter plate armor.
Interestingly enough, you're partially right about the fact that swords were also used as blunt weapons. However, in this case the weapon was flipped around. You have both hands on the blade (wearing gauntlets of course), and you swing at your enemy and hit them with the pommel.
http://en.wikipedia.org/wiki/Mordhau
In any case...before I derail the thread: Oblivion was generally much better with "realistic" weapons in that the claymores were of realistic proportions. I haven't found much in the way of realistic weaponry in Skyrim, but they still look pretty cool.