Yes, they are Capable but they cannot compete against those Real DPS Classes
lol.
I admit however, that it's hard to see when you look at the skills:
ASSASSIN:
Double Attack: 25% damage, 1sec cooldowm
Deadly Blow: 25% damage +7% per combo point
Shadow Explosion: 85% damage
Combo Mastery: 15% chance for +1 combo point = 15% more points on average
Shadow Form: + 30% attack speed => +30% more damage on average
Shadow Cloak: 5% chance for double damage (crit. chance) => 5% more damage on average
G. Mark: 2% chance for double damage => 2% more damage on average
Shadow Fiend: 12% for 22% damage => 2.64% damage on average
WARRIOR:
Bash: 25% damage, 1sec cooldown
Aura Strike: 25% damage; +7% per aura
Rage Strike: 90% damage
Rage Control: 5-20 rage points => 12.5 points on average = +25% more points on average (if compared to the original 10 Rage = 1 Aura)
Berserk: +20% damage (usable half of the time => +10% damage on average)
Aura Sword: +10% damage
Battle Order: +10% STR => ~5% more damage
Battle Tactics: 0.4% crit. damage per INT => assuming 10% crit. chance and 125 INT = 5% more damage on average
(20% crit. chance and 250 INT = +20% damage on average)
So you would expect that a Warrior can compete, but it's not true. But basically this is due to the overall weak Aura Sword and Berserk, but it also comes by the fact that the gear grants different boni:
ASSASSIN:
All Colo gear: STR ~540, AGI ~230; Defense ~930
WARRIOR:
All Gear: STR ~620, AGI ~70; Defense ~1240
It's +160 attack power (80 STR diff x2) vs. ca. +15% more crit. chance (160 AGI). And this is where things went wrong in RO2: STR is a flat increase (your weapon damage doesn't matter). AGI also grants a flat increase in Crit. chance, but since the damage is doubled (not increased by a certain amount), the damage of your weapon really counts here. In the example above: If your base attack is ~1000, both would be quite balanced. But by the way you have all your skills maxed out, your base attack bonus is much, much higher, maybe around 2.500 or more.
BUT: For AGI to be much more valuable than STR, there has to be the level cap. Right now, you can wear lvl 60-70 gear (Colo, CoA or AoD WITH +10 refinement), your level stays at 50 however. And at this level, +160 AGI means much more than it would do on lvl 60 or 70.
Another note: Although the difference in defense between Assassin and Warrior Colo gear looks like a big favor for the Warrior (+33% more defense), the actual difference in damage reduction is about 7% (21% vs. 28%). This is easily negated by Berserk.
All in all, that's why I would like to see the following changes:
lvl 5 Aura Sword: +10% damage, +5% crit. chance
lvl 5 Berserk: +40% haste/vigor, +40% movement speed; but -40% defense [maybe cooldown set to 90sec]