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Berserk is awful, HP is not displayed as 0 (meaning you don't know if you died or not) and even if you heal you insta die after 5 seconds, I would say its a negative skill.
I picked the one that creates a 3500 damage shield because I often tank with super armor, other characters may find a different effect more useful.
As Nokaubure said, Berserker is not a very good ability. The worst part is that it doesn't stack with Life Flare. You will die no matter what from its effect, even if Life Flare saves you at 1 HP. Unless you react quickly, I doubt it even gives you enough time to Party Feather to prevent a raid wipe scenario.
Other than the obvious PvP usage (although no one does PvP on missions anymore), you could probably use Berserker when cheesing mechanics like Dullahan. (less)
Best of luck. I play on NA, but I usually try to give away the resources I get on the other servers. However, there are too many level restrictions and bound stuff nowdays. I'd offer to … (more)sell my +10-15 coupon to help, but I only have a level 45, and I lack the unbinds even if I were to level up. (less)