A typical Warlords is YC level. Too bad most of their crews are so far disappointing.
Crocodile: One of the weakest Warlord, but dammit, Baroque Works was awesome for its time. They're not his original crew.
Moria: He has only three members, but this wouldn't be a problem if the weren't weaklings (Eneru's priest were more impressive!). Absalom, the strongest, gets OWNED by Nami. Perona is tricky at best. Hogback has very useful talents, but he's clearly not a fighter. His general zombies make up for this, but still. Maybe his original crew would wow me more.
Kuma: No crew to speak of. I think he has a fake pirate crew who are members of the Revolutionary Army.
Hancock: Just two main members. Unless they weren't giving Luffy their all, they're not all that. Maybe I'm going off limited details on Hancock's crew (there could be other main members besides the sisters).
Jimbei: I hope Aladdin isn't his ONLY top guy and I hope he's veteran level. Otherwise, at least he joined Luffy's crew.
Doflamingo: The second crew to actually impress me.
Mihawk: No crew to speak of, so I have no comment.