OK, since you do not want "solutions", only to catalog what players perceive as the "problem" with ordnance, I shall not offer you any of my (proposed) fixes. Instead, I shall put forward some thoughts on what ordnance should and should not be...
1. SHOULD NOT be so powerful (cost effective) that they become the primary weapons of most ships in competitive play- guns should still be the most common weapons. Reason- how much ordnance did we see being used in any Star Wars canon compared to lasers/blasters/whatever "pew-pew" weapon you have?
2. Ordnance SHOULD be effective against the type of target it was designed to be used against and less than optimal against other targets. Heavy ordnance (torps/missiles) should be cost effective against heavy targets... "anti-fighter" weapons should be good against fighter-sized targets but poor vs more heavily armored targets. The game effect should at least imitate the movie effects (which are based, in part, on "real world" stuff).
3. MY CONCERN- any fix to make ordnance cost effective for use in tournament lists will make them over-powered in Epic play (which is where I think they should be most useful*). On the other hand, any fix that makes them cost effective in the Epic format (without being over-powered) will likely not placate those who mostly engage in competitive play as it will not automatically make (insert name of favorite ship/squad here) the most dominant list on the tourney circuit.
* What's Wrong with Epic- I love XWM and, in general, I think the FFG designers have done a great job (with ordnance being an exception) and I love Epic play most of all because Star Wars is... Epic! And the most epic part of Epic is the huge ships. Compared to small fighters and large(er) ships like gunboats and light freighters, huge ships are really tough... or should be. Unfortunately, FFG made huge ships expensive, much more so than their smaller brethren... but no more resistant to damage! In fact, even the mighty Rebel CR-70 Corvette (a purpose-built warship) is quite vulnerable even to lowly TIE Fighters. If they are vulnerable to even such low-powered attacks, where is the need/incentive to take heavier/more expensive ordnance? IMO, huge ships either needed to have a LOT more Hull points OR fighter-class weapons (not ordnance or Cannons, like HLC) need to do less damage. Either way, small ships (with their "small/weak" weapons) are much too effective against huge ships.