Not sure whether this one has been brought up before. IN Oblivion when you hit someone's shield your sword bounces back, but when you hit their body, the sword just goes right through. It might be realistic for daggers and short swords, but for long weapons it doesn't work. Normally when you hit someone with a long sword, if it doesn't chop part of his body off, the sword should not stop where enemy's body is. Same goes for blunt weapon, it'll stop where it hits and probably will push the enemy towards the swung direction for a bit, but there's no way it'll clip right through.
I don't know whether this is possible to implement though.