I've never actually pvp enough with unholy or frost dk.

What are their bursts like? Frontal ? or there is ramp up time (like wait for 6-10 seconds to get that 3 holy power up). I am hoping to use my main DK as unholy for the 8% sp buff and AMZ. But when I played unholy, it felt like an affliction warlock in plate, all chip damage.

What rotation do you use for bursting.