@Monkey:
And when you see how Kyros defeated Buffalo very easily, how both Buffalo et Baby 5 couldn't do anything against the Franky Shogun, it's hard to consider the officers like real threat to people of Luffy's level. so against people like Ideo or Blue Gilly, they should show a good fight and even if they lose, at least we'll be able what are their powers. And let's not forget that the "real bosses" are the Highest Officer : Trebol, Diamante and Picca.
I wouldn't assume the rest of the officer's power based on Baby 5 and Buffalo. Rank or position is never an indicator of strength in One Piece. Bastille and Maynard went down easily, but if it was Onigumo and Yamakiji (who are both implied to be very powerful), would it have been the same? They're all Vice Admirals, but there's a clear difference in strength between some of them. I assume that's the same case with the Donquixote Family officers.