Hello,
I'm a fan of Shottyman/double shotgun. In one of my recent games I managed to find advanced double shotgun ((6d4)x2). What can I say - it's nice to kill Arachnotrons or Arch-Viles in 2 shots :). Barons are sturdier than that, of course, so for them I still use "get next to them, switch to CS, kill in 3 hits" routine unless I can take them from afar with my (advanced) rocket launcher.
On higher (than HNTR) difficulties, though, I get hit way too much while closing the distance with a shotgun. I'll have to learn to use plasma rifles, despite the ammo being much scarcer.
FWIW,
Zarin.