To the people who say Batman's gadgets give him an edge, I can't really think of any gadgets he could use to beat Saki. I mean, the dude's a NINJA, so smokebombs actually help in the stealth department and throwing batarangs wouldn't help because of his reflexes. Magnets would effect Bats as well, so that's a disadvantage for both of them, and the taser shouldn't be able to pirce the Shredder's armor, right? All i'm saying is that this comes down to HTH combat, honed reflexes, and stealth prowess, and it takes four genetically altered reptiles who've been practicing ninjutsu for fifteen years (TMNT 2003, they're fifteen) to even slow down the Shredder in most encounters. If Bats doesn't have a plan, like, Z, Shredder takes this IMO.
Batman doesn't even need to use his gadgets. I mean he can if he wants to but the thing is that he wouldn't have to. He can take the majority in the fight with only raw strenght, a great plan and lots of usage of his skills. He has defeated an opponent who seems to rival Shredder (Talon) while being psychologically tortured and in a pretty bad physical state, and yet he embarassed him in front of the Court to a state in which he was useless. I do think that Batman can pull off the same things against Shredder as well, nothing is stopping him.