Commando's are one of the best classes by far. They specialize in killing the most annoying monsters(except for maybe fleshies) They can kill crawlers and stalkers is 1-2 shots. Can kill sirens pretty quickly by just gunning at them with bullpup\Scar\ or AK47. They can kill Husks with a few shots to the head with Ak47 or Scar and about maybe 15ish from bullpup.
And they can see the Patriar's health and can see him when hes invisable. Also very helpful being able to see the invisable stalkers and being able to see the health of ememies