That's because you're not seeing it from the perspective of a Mercenary trying to get into rateds. We're not good enough.
Do we have an execute? Do we have a heal debuff (like snipers) Do we provide a crowd aoe shield? Do we provide much utility? Do we have an aoe denial of area ability (snipers) Under focus, does our damage remain the same? (Snipers and other damage classes)
Snipers execute is silly in how much damage it does and only way to dodge it is to los. While basically every ability in our belt is shutdown by ranged and melee interrupts, as well as stuns and knockbacks. Snipers don't have that issue.
No,I know where you are coming from. I've played one before. I've also played dps scoundrel, which is probably welcomed even less.