Really feels like defensive ability is missing for Viper.

[Gr1mwolf]

Viper's defensive cooldown is Feint, which it shares with every other melee. It doesn't need another defensive cooldown, just because other jobs have one.
It's okay to be different.

It makes Viper a worse job, without any actual compensation. Other DPS have defensive cooldowns. Other DPS have raid buffs.
Viper gets none of that, and still only deals the same or less DPS.

[Urthemiel]

It makes Viper a worse job, without any actual compensation. Other DPS have defensive cooldowns. Other DPS have raid buffs.
Viper gets none of that, and still only deals the same or less DPS.

It doesn't make it a worse job at all lol.

In a raid scenario all it means is that when you get hit by a raidwide you drop maybe an extra 5% to 10% lower than everyone else. Sure, that could be the difference between life and death, but you can circumvent that through Second Wind (especially now that it has been upgraded) and Bloodbath. If you feel it really needs to be compensated for its lack of a defensive buff, then they can just simply buff the potency to reflect that, as ultimately that's a balance issue, not a kit issue.