I'm going to assume you play as the typical hybrid madness/lightning spec. If a marauder charges in, electrocute him immediately and force speed away as soon as the root has ended. If he's rage, he'll use obliterate to close the gap, which is when you should use your knock back to keep distance. Abuse the hell out of force slow, and keep your dots on him. Stopping to cast can be a dangerous move unless you know it's just you two and you have enough time to do so before he closes the gap.
As a marauder, as soon as I charge in I like to hit with crippling slash just incase so be careful of such things. If you find he is only using charge to close the gap every 15 secs, well so much the better but still be cautious because he is probably annilihation still keep him at distance, he may not burst you down but he has enough dots that'll rip your bubble to shreds and then he can nuke you if he catches up.
Carnage marauders probably are the easiest to kite but still you need to stay more than 10 yards away from them because they have the most rooting talents of the 3 specs. This is the spec I use currently at lvl 40 since I found it quite useful in huttball. Having both deadly throw (10 m ranged attack) and ravage (channeled burst damage) able to root the target in place, combined with automatic Force scream crits with ataru form procs, can easily chew through a sorcs bubble and your health pool rather quickly.
I know I didn't give you too many tactics to go with, since I'm unfamiliar with sorc game play at higher levels, but I hope my insights to marauder play style might give you some concept of how to counter act us =) Good luck brother