ARC Auto-attack = Ranged attack..

[Corrderio]

Have you played Lancer in the Ifrit fight? Doomspike has a long animation lock, much much longer than a light shot.
Any class is viable in the fight, it's all a matter of the player learning to hold back on using that next action.
The fight is about survival, not DPS zerging.

Heres the thing about LNC, I can move and not have to worry about my AA locking me out. Archer on the other hand has to, meaning their DPS will suffer more. Top that on their already low DPS and they're crap.