What is this bullshit about Jade falling to Qui-Gon? Lack of experience? Lack of skill, or power? She almost managed to kill Jacen, the guy who half of you think could magically kill f***ng Exar Kun. Yet she can't beat an above average Jedi Master who she's actually older than? She has vastly more combat experience than almost any PT Jedi, Yoda aside. She's quite literally a strategic genius, given that she's managed to outfight and overcome opponents either more powerful or more inherently skilled than her. And she also happens to be one of the premiere melee combatants of her era. Hell, I'm led to believe that she almost killed Jacen, a much younger, stronger, and more powerful enemy, in a brawl? Seriously people, talk about not giving enough credit.
Now, this is only going to take her so far. Assuming she's in an area where she can hide and mask her presence well enough, I'd say she might, might be able to make it to Dooku. Qui-Gon shouldn't be overwhelmingly difficult, given that he doesn't exactly excel at anything in particular. Anoon Bondara is probably a formidable lightsaber duelist, but I'd be willing to bet that she could hold her own against him for a while - she's not the most powerful person around, but her skill and quick-thinking will probably be able to get her past the decidedly less aggressive and brutal Jedi.
But Maul is a different question. Given that he's considered one of the best assassins and martial artists around, he's certainly not going to be dispatched as easily as a less aware and less experienced opponent. Now, I'm not up to date on the exact details on the fight between Jacen and Mara, so if anyone could fill me in on that - bias not included - I'd be grateful. I believe she got into a very physical, very gritty brawl with Jacen, hand-to-hand, and close saber-combat. One key thing she has going for her here is that she can mask her presence in the Force very well, and can obviously hide her physical presence like no other - years of espionage and assassin training can do that. So, she might be able to get into cover, maybe lash out a few times to piss him off, keep him from thinking clearly. She would probably make herself seem weak, or act as if she's running away, so as to make him cocky and irrational. And then, she would strike. We already know that Mara's a patient and calculating warrior, while Maul's a hotheaded, arrogant animal. Fogging up his mind and playing head games with him as only a Jedi Master/Assassin/Emperor's Hand could do would probably put the odds in her favor. Personally, I think if she played her cards right she could past him. If not, he might be able to overwhelm her in a lightsaber duel, melee monster that he is.
Assuming she does get past him, I'm not sure she'd take out Obi-Wan. In lightsaber combat, without the application of more offensive Force powers like choke or lightning, and truly bitchy use of the environment - chucking things at him, hurling shattered window glass ala Voldemort, etc - she'd probably never be able to pierce his defense. But the above things aren't beyond her, and we know she's willing to do whatever is necessary to make something happen, so it's possible.
When she gets to Dooku of course, she's completely f***ed. The guy has pure power on his side, the kind that she most likely doesn't. Mara doesn't have a prayer in a duel, she most certainly can't beat him in a Force contest, and given that he too mastered the technique of masking oneself in the Force, she's probably lost one of her biggest advantages. Not to mention this time, she's facing the most ruthless motherf***er on this gauntlet.
Now, I'm sure some of you will look at this and think of my argument for Maul, but Dooku has several key things going for him here that Maul doesn't. For one, his lightsaber skills are solidly above Mauls. They aren't too far apart, in my opinion, not enough for a pwnage comment. But Maul is not as overwhelmingly superior a duelist as Dooku is - I don't think he'd be able to contend with the likes of Mace or Yoda, personally. So while Mara might be able to hang with Maul in a duel, she's definitely toast with Dooku. Second, there's the Force issue. A lot of you will argue that Maul is indeed an accomplished Force user and Dark side practitioner, but whether that's true or not he is Dooku's complete inferior in that department. As in Dooku would make him his ***** in a Force battle. So while Mara could definitely hang with Maul here, maybe even get the better of him, Dooku would annihilate her. Lastly, there's the whole Dooku/Maul mindset. Dooku is cold, efficient, and as I've said before, ruthless. If he finds himself against a dangerous enemy he's not going to toy around with them and risk his life. Unlike Maul, who could've easily walked away from Naboo victorious, but instead managed to get sliced in half by a guy hanging from a pit. Maul is way more likely to screw up even if he gets Mara on the ground, defenseless and unarmed. Like, he'd probably toss away his lightsaber and try to rape her, in which case she'd immediately rip his balls off and stuff them down his throat. Dooku? He'd fry her. And laugh. And not give her any chance to make a comeback. So without a doubt, while she may, and probably could make it up here, she's definitely not moving on to 6.
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God, damn was that long.