The AUG is a medium damage assault rifle. With fast fire rate, plus excellent accuracy, the AUG is great for enemies at any distance and is especially useful for taking out enemies that can be too far to accurately hit with other assault rifles. The AUG has great recoil control in Critical Strike Portable and Critical Ops, so it can be used to spray-fire while maintaining its accuracy.
In turn in Critical Strike Portable, however is the medium damage. If engaged with an enemy sniper equipped with weapons like the AWP Sniper, the latter has a better chance of killing the player due to the higher damage. In Critical Ops, one is the higher price. Players may choose more inexpensive weapons like the AK-47 or the M4. The other con is the fairly slow reload time, so seeking a good spot to hide and reload is recommended.
The AUG is a clever combination of a sniper's accuracy, while maintaining good recoil control, which in turn, is a favourite for many players.