Remember, a critical is basically a hit that does max damage (Swords have tight damage ranges, so this doesn't really do much) and hits as though you have +4 to your sword skill. Basically when you crit as an A/W you hit as though you had 16 Swords. If you crit as a W/A you hit as though you were at 20, plus your Sword Mastery would make the damage bonus from skills like Dragon Slash/Final Thrust/Whatever much higher than the A/W.
Axes are slightly better for this because their damgae range is wider, theoretically Hammers are even better. However, you pop Frenzy as an A/W with a Hammer and you are going to die, fast. Plus, you need to stick on your target for a considerable amount of time to build up Adrenaline for your spike, whereas Assassins are clearly a "get in, do combo spike, get out" style of play.
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