User blog comment:Black Leg Sanji/Scale 1-10: The Marines Scared of Certain Crews/@comment-3130944-20110309084604

SHs-6 they wreaked havoc in marines 3 powers (Enies Lobby, Impel Down, Marineford) but sensible like the ones below

RHs-7 they are very strong but they won't do dangerous things ıf marines don't piss them, they are somewhat sensible

WBs-8 same as RHs they are sensible and are not dangerous ıf Marines don't piss them(Like execute Ace)

BBs-10: They are the ones who they should scare most they can attack them without a reason.

If you go to Pirates page in this wikia you can see there is 2 types of pirates: Peace Maine and Morgania, Peace Maines won't be trouble for Marines as they just being pirate just for fun somewhat (RHs,SHs and WBs are example of it), But Morganias will be trouble for them(BBs, Kuro are example of this type of pirates)