I have the 2 classes at lvl 50 and if the marauder/sentiel has the right talents is impossible to kite (the ones that say that is or are playing against bad ones or you are lucky cause he decide do change target). The best thing is not to be in 1v1 against one. There is plenty of ways to do that (never defend alone a objective with a low survival class, never be in the front line, try to be in good kite spots, all wz have those). If you keep that in mind you dont have to worry much about marauder. Remember that you arent playing alone