Ussop's strength

[Organizized]

Actually no.... he said that, while looking to kidd´s and Law´s crew...
its possible that he only didnt targeted the SH because they were the ones closer to hacchi, and because he seemed to know that they were the ones who saved the fishman (he even thanked them for that).

This is most likely imo. He might even have known who were in Luffy's crew and who weren't from the newspapers, but most likely he just skipped the people close to Hachi, which means he aimed the haki at everyone except the slaves, pappag, Hacchi and the Straw Hat crew.

Not that I don't think Usopp could take the Haki.

 

[Oblivion]

Lysop's most awesome moment and proving that just how good he can be at times

http://www.onemanga.com/One_Piece/419/16-17/

now he's going to be one great sharpshooter

 

[Umbra Wolf]

actually, that can be a lil plothole, since he said he just shoot, not taking notice of who was there (he didnt say it like that, but he said "oh since you are still standing that means you are no amateurs" meaning he shoot to everyone in the room)

Completly right.
One of Trafalgar's men even feels the effect of the Haki blast and nearly blacked put.
Look

 

[gao_dargon]

^ that was exaclty what i was talking about but i couldnt say it like that cuz of the one week rule, but that was my point