The only classes that can reliably counter cloak and saber ward are shadow and operative (and their respective counterparts), because they can vanish after saber ward is popped and wait out its duration, effectively removing both cooldowns from the marauder and resetting the fight in the stealth user's favor.
Because of this, a properly played kinetic shadow can reliably out-duel a marauder if he has vanish available when the fight starts and saves it for the right moment.
Operatives and DPS-specialized shadows can use this strategy too, but the duel can still go either way with theses classes because their damage to survivability ratio is much lower than the tank-specialized shadow.
That's been my experience with it, anyway. Dueling a well-played kinetic shadow can really change your opinion on what the class is capable of.
I don't think it's as easy as it sounds to counter Marauder cooldowns if you can't vanish, though.