I find myself quite unhappy with the state of my achievements. Now Captaining and Engineering are by far my favorite roles, and as a Gunner I just always feel a little.. limited. Of course it's nice to blast that wretched galleon in front of you to pieces, or see that "Kyren destroyed this and that" on the upper left part of the screen, but.. just my personal preference.
I totally agree with you on the topic, though. It looks much more convincing to see that the player that just joined your crew has had a share of playing every role, and will understand at least the basics of what is required of all the other crewmembers. That's basically why I've reluctantly given in to playing gunner at times. I'm able to choose the right ammo for the right moment and gun, but more so because I skimmed trough all of that when I began to outfit my ships and tactics for them. That still didn't prepare me for different turning and muzzle speed, having to wait for the Engineer to extinguish my gun because I wasn't aware enough to switch to heatsink in time, etc. It really helps to get a somewhat decent level in all the roles, and I hope I can raise my Gunner level somewhat in the matches to come.