Well, it's not too expensive and designed to be a ship that can carry alot of fighters and torps.
Probably the same people who initially thought the Stealth was a piece of junk also think this ship is a piece of junk.
When you don't want to risk your nice big ship filling sectors with fighters and mines you can use the far less expensive Munitions ship. That way if there is some bad guy waiting for you to show up you won't lose your big ship when they attack you right after you drop fighters and mines.
It's not a ship you use in the early part of the game. People will learn.