sab has spammy sustained dps, but absolutely no burst other than sab charge, which is only 50%ish stronger than every other spec's sab charge (its not a new ability, unlike trick shot and wounding shots, just an upgraded one).
Same with DF, not much on demand burst (wounding is good burst, but sucks up energy and has a 9s cooldown. it also requires 4-5s of ramp up).