Well Picard was the diplomat, so he'd need to be good at the big speeches (plus Patrick Stewart has a great voice, I could listen to him all day long).
Not everyone can manage to be so eloquent, you just have to listen to one of Archer's to see how badly speeches can be given.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)