genocide just has high damage. the problem is that it has a high cooldown, is slow casting, easy dodgeable (which suxx in pvp). sure, the def lowering effect is great, but what else are good 2h skills?
People will want you for tanking later, that means you need blindjab and bounce defender to survive at bosses. Shield Aks tank better than any Bagi to be honest and they also help their whole party with bounce.
there aren't enough good 2hand skills to make it worth using. Sure, a dual axe + 2h axe build should be deadly, but you are paper, which suxx at endgame.
just for example: i could solo space with total crap gear on a pserver with a 130 ak just because I had blind jab

this skill is awesome, pvp and pve wise(when you need it vs mobs, else vs bosses)!