That's still pretty freaking sad.
Why? Sniper rifles as a main weapon would just be silly. What kind of spy infiltrates an enemy compound running around with a giant rifle on his back? Assault rifles are pushing it, to be honest.
You really lose the feeling of being a badass sniper when you're using it like a slow-firing assault rifle at 100 yards, anyway, which is what you'd end up doing if it were a main weapon.
Sniper Rifle in Deus Ex.
I rest my case.