I have been playing warrior at lvl 17 in pvp and im able to kill almost every rogue i face. Key thing is to get shields on and spin. During spin charge normal attack and rogue is stunned after that skyward smash and rogue should be dead :)
Not too hard if you know what to do. Sorcerers are a bit weak because they die as fast as rogues and does low damage to me. Also if i run around with rogue, we can easily defeat 5 opponets coming to our flag gem room.