Yes, i agree that Zeratul isnt viable because of stuns, but look at links down below.I played Zeratul with this same build and we were dominating all game. This is great against single target and against enemy healers because you can burst them down in second. At level 16 i took rending cleave because i think thats better talent than Berserk,we had took Searing Attacks and thats enough of burst damage for 1 target.rending cleave is better at the late game when you can do lot of AOE damage...