GENJUTSU
As most of us know, genjutsu techniques manipulate the flow of chakra in the victim's brain, thus causing a disruption in their senses. Now, in order for genjutsu to be created, a ninja must control the chakra flow of the opponent's cerebral nervous system, thereby affecting their five senses.
To combat the effects of genjutsu:
Now in order to break genjutsu, a ninja needs to stop the flow of chakra in their body, and then apply an even stronger power to disrupt the flow of the caster's chakra.
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CURSE MARK
According to Kabuto, each curse mark seal itself contains Orochimaru's chakra and also contain parts of his consciousness, similar to that of a tailed beasts their jinchūriki. Now, in using the cursed Mark, the user receives increased chakra levels and physical capabilities when the seal is active. During this process, the seal forcefully absorbs a user's chakra while giving Orochimaru's own senjutsu chakra into the user's body in return. Similarity this is how perfect jinchuriki are able to break genjutsu effects. For possbile proof, Sasuke may have sharingan but it wasn't until he used curse mark when he was able to break free of Itachi's genjutsu
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So, in the end curse mark users are able to break genjutsu once using the different stages of their curse marks. Ultimately this meaning Kimimaro>3-tom Itachi and possbily Sasuke, but this is lesser of the concern =D
AGREE???
resouces- good ole wiki!