This was a really intense watch, but enjoyable nonetheless. I think the show did a fairly good job of portraying the reality of a broken military system. It definitely didn't shy away from showing all the abuse and brutality that takes place in the military. With only 6 episodes, the plot moves quite fast - things will go from 0 to 100 in the blink of an eye, but I think the fast pace was perfect for this kind of show.
I especially appreciated the show's abundance of funny scenes to make up for the heavy bits. The comedy didn't try to downplay the serious topics but instead tried to lighten the atmosphere. So, kudos to the writers for balancing that mix well. That being said, D.P. is filled to the brim with many emotional and serious topics, so make sure to look into trigger/content warnings before you watch (i've listed some below).
As for the acting, I think everyone in the show did an amazing job portraying their characters. The development of Jung Hae-in and Koo Hyo-wan's friendship was done very well and I found myself feeling so cheerful watching their interactions. Koo Hyo-wan's character was probably my favourite part of this show.

Trigger Warnings for those interested in watching D.P.: bullying, sexual harassment, blood/mild-ish gore.