Sometimes I'm getting beaten by mobs even I'm a 4th job and I use lower jobs they are good for killing mobs... so I'm just saying that not all 4th jobs are good.
Here's my opinion about it:
Elesis:
1st job(knight): PVP/Dungeon
2nd job(Spearman): PVP
3rd job(Sword Master): Dungeon
4th job(Savior): PVP
Lire:
1st job(Archer): PVP/Dungeon
2nd job(Crossbowman): PVP/Dungeon
3rd job(Arch Ranger): PVP
4th job(Nova): PVP/Dungeon
Arme:
1st job(Mage): PVP/Dungeon
2nd job(Alchemist): Dungeon
3rd job(Warlock): PVP
4th job(Battle Mage): PVP/Dungeon
Lass:
1st job(Thief): PVP/Dungeon
2nd job(Assassin): PVP
3rd job(Dark Assassin): PVP
4th job(Slasher): PVP
Ryan:
1st job(Druid): PVP/Dungeon
2nd job(Sentinel): PVP/Dungeon
3rd job(Viken): PVP
4th job(Avenger): PVP/Dungeon
Ronan:
1st job(Magic Knight): PVP/Dungeon
2nd job(Dragon Knight): PVP
3rd job(Aegis Knight): PVP/Dungeon
4th job(Abyss Knight): PVP/Dungeon
Amy:
1st job(Dancer): PVP/Dungeon
2nd job(Muse): PVP/Dungeon
3rd job(Siren): PVP/Dungeon
4th job(Sistina): PVP/Dungeon
Jin:
1st job(Fighter): Dungeon
2nd job(Champion): PVP/Dungeon
3rd job(Asura): PVP/Dungeon
4th job(Deva): PVP
Sieghart:
1st job(Gladiator): PVP/Dungeon
2nd job(Warlord): PVP/Dungeon
3rd job(Ares): PVP/Dungeon
4th job(Prime Knight): PVP
Mari:
1st job(Ether Tech): Dungeon
2nd job(Gunslinger): PVP/Dungeon
3rd job(Polaris): PVP/Dungeon
Tell me something if some of this jobs can be good at another way around & most all 1st job can be PVP/Dungeon due to skill trees.