Tbh there are enough other decent options in the tree that we don't really need something like that. Also, the HP buff would be raid wide which is more of a guardian thing imho. Another thing to consider is that such a change would not really help close the gap in Max Health between Berserkers and the other fighter classes since the % increase in max health would apply to everyone in raid. Although I will admit that the 5% MA granted by this ability is no longer really worth having in your spec unless you are poorly geared. I like both Jeering Onslaught and Utter Destruction the way they are. There isn't any great need for these abilities to not require a target to be cast. Also, Wall of Force has its uses despite not being extremely reliable until you have the PoW mythical. If the % max health req. was lowered then you'd simply be more likely to have the triggers used on something trivial, and if the ability were to be changed to absorb all attack then it may be deemed "over powered" by other fighters.