Sure, for the duration of rush, granted cata has painbarrier on at the same time, would give them a chance, but doesnt really put them in a good spot where they could be considered just as good as other classes,
example, for the duration of rush
A Scout would just hide in a barrel
A Cleric would safety wall
A Cryo could icewall, if cryo somehow has that available.
A Druid can Sterea Tofh
Not tested, but a falconer could probably use hanging shot, as desribtion says it “Prevents damage from close ranged damage”
If the Cata doesnt have painbarrier on, classes with knockback abilities would cancel the rush with 1 single hit.
But dont forget for the duration the cata needs to spend getting closer to you using rush, thats duration wasted for more potential dps.