I did a NB run last night Destro, without BR - a good group (I was the PUG and lowest ilvl). I have never felt so carried in my life and it was mostly due to being late to most fights ). Monks, Rogue, Bear and by the time I tried to AoE (as in by the time I caught up with the group ) mobs were almost dead. Starting at the same time FnB + Sac was really good, except against the monk.
I am overstating as the melees did enough AoE so I wasn't really needed.
Something else that irked me, I actually thought cleave would work like previous NB runs but both on Curator and NB the adds died too fast (Havoc and they died mid Chaos Bolt cast). When overgearing fights destro looks like it loses a lot of usability.