I've been devoting a little thought to the way these two classes kill.
I don't see warriors as merely beefy buffoons that indiscriminately beat their opponents down by sheer strength and endurance alone. A trained warrior is highly skilled at striking at a foe's weak spots, as anyone who's been on the receiving end of a well-placed blow to the neck or wrist can attest. He knows that a blade through the heart or slashing through a major artery will mean victory.
The difference between the warrior and the assassin is that the warrior's foe is actively defending himself. There's nothing magical about an assassin's backstab; he also knows where to strike but has the advantage of surprising his prey. That's where the difference is. When a warrior attacks a subdued or helpless opponent, this effect is seen as well.
Sounds about right, but of course they both use different methods to achieve their goals.
There are few problems that cannot be solved by the suitable application of high explosives.