i personally don't mind 2 to 4 hit kills its how i've been set up ever since the haunted ruins but the sets need to give either def or armor not a balance between the two because you won't be able to survive the battles.
I had to change the way I set up my items about 10 levels ago, and the first thing I do when I enter a new area is make sure my Armor is as good or better than the damage of any creature I have to fight. Then I make sure my Atk is high enough to get through their defense. At that point, there isn't much left for my Damage, though i've been lucky enough so far to get 1-2 hit kills, sometimes 3. I don't mind this so much either, the main complaint is simply that the sets are useless cause you don't have the choice to set yourself up this way.
If there were 2-3 sets at each lvl milestone (110, 120, 130, etc...) that mix and matched, some with high armor and attack, others with high defense and damage, and one with just high attack and damage, we'd be in the same position now, only have a set that was better at those match-ups than common items and we'd have something to look forward to when fighting elites with 4 times as much armor/hp as any one player in the game has damage to kill on his own (hence the 12 person attack groups)