If You loose 19 of 20 SCs then it's either really bad luck or time to consider if maybe You are part of the problem. I have both 2x 40 destro (1 ranged Magus and 1 BG tank) and 2x 40 Order (1x ranged SW and 1x tank SM) and the frustrations are the same for each side really. I do almost only PUGs and some days are just better then others for SCs. A good meleetrain from destro can be hard to deal with, but 4 good order ranged assisting eachother is just as lethal, as they will melt away anything in seconds. But really the whooe idea of 1 side being generally stronger than the other is just nonsens.. its all a matter of skill (or lack of), teamwork and knowing your class and what you are fighting.
A destro melee train is only possible if its 4-5 players assisting eachother - but don't ever think that order cannot do the same. 2x wl 1 sm and a slayer assisting eachother is not something You wanna face as destro. But this setup of players in a PUG is not something you'll see every time ofc, but that goes for both sides. When youndo a lot of PUGs you have to just accept the fact, that you will very seldom have the perfect setup of classes, but that often goes for both teams - so it all comes down to the skill of the players.
In my experience when I take a tank out, the group often lacks hard hitting Dps, but when i switch to my dps, then the group is really lacking tanks/melee... I don't remember what this is called, but I know im not alone in this

Still, if You really think that the onky reason while Order is loosing too much is because there are not enough good tanks who guard etc, then roll 1 and turn things around. I'm just pretty sure that You will end up yelling about lack of good healers and not enough hard hitting ranged dps...