Never met a good one! All power crazed, brainless morons with IQ's slightly less than their hat size!
Of course on God's vessels (submarines), we didn't have to suffer the mindless gibberings of such lesser beings.
I'm told that during their training they all get concrete injections and have the Regulator Interlock fitted. (Regulator Interlock: every time they open their mouth a flap drops over their brain)
Having said that, they do their best under difficult conditions, i.e. having hearts of stone, and the inability to comprehend human life.
Bite anyone????