The good thing about the military is that they are well trained, and could probably accomplish just about any task given to them. Without an army, I'm sure that we'd either be dead or speaking another language right now. Also, plenty of them like video games, which makes them coolbros.
The bad thing is that while they're well trained, too many accidents happen when we intervene a situation. For example, when we liberated Kabul from the taliban, many people were happy, as they were able to fly kites, listen to music, and walk around by themselves in public. However, the "surgical" strikes we performed weren't actually precise. Hundreds of civilians died as a result of inaccuracy.
But, if you ask me, the benefits outweigh the negatives.