Donāt worry, Barbarian is still pretty good at c2 or c3.
Warcry helps a lot if you are fighting against multiple enemies in PvE. Other Barbarianās skills also have good AoE range to help you in PvE.
However, I donāt recommend you to take Swordsman c2. Itās a complete trash. Get Peltasta c1 instead and you are good to go.
Peltasta c1 offers better skillset compared to Swordsman c2. Swashbuckling is really good in PvE aspects such as grinding, dungeons, guild raid, earth tower. It makes your life as a Swordsman a lot easier. Not to mention you can grab Guardian at level 1 for its bonus 18% evasion attribute, and more knockdown skill from Umbo Blow.
On the other hand, Swordsman c2 only offers more powerful buffs such as GungHo and Concentrate that scale pretty bad at late game. You also get half4ss Restrain with 20% chance to stun (20% is really small and almost close to useless). The only good thing you have from Swordsman c2 is more level for Pain Barrier.
Pain Barrier vs Swashbuckling-Umbo Blow-Guardian?
The answer is clear.
So your build should be like :
Swordsman > Peltasta > Barbarian > Barbarian > Corsair > Corsair > ?