hahahhaha! you have to understand that maul is better then almost EVERY jedi knight other then the 'special' ones.
other then: obi-wan, anakin, dooku, yoda, windu, sidious, grievous (even tho hes not actually a force user)
maul would pretty much ***** slap any of the other jedi knights/ lightsaber weilding people.
Well, Assajj could get a one up on Kit Fisto, and he's no pushover, regardless of his sudden and crappy death in Episode III (Am I the only one who thought they overdid the Sidious being a good fighter deal with the three insta-kills?) He was considered very close in ability to Obi-Wan (Better at unarmed combat, but Obi-wan had a tighter defense and calmer attitude) To simply dimiss her in this case isn't fair because she wields twin lightsabers with reasonable skill, and was trained by Dooku who, in my all-knowing opinion, could punk the hell out of Maul in a battle.