This is not for everyone. In fact, this employs common tropes that are common in isekai. But my, what power fantasy is this. If not just pew pew, boom boom, there are a lot of element of diplomacy which is central in modern military as well. You can attack everyone to gain supremacy but modern weaponries are expensive. You also need trade to support modern living, which is why alliance is important. The only problem I see, the are just firing precious expensive ammunitions that are hard if not impossible to reproduce, since most of military tech in democratic countries(including Japan) comes a lot from joint work withother countries. The replenishment of those are not going to be easy, if possible at all.

For the drawings, all the characters... doesn't look that good, but recognizable. However, buildings and environments looked amazing most of the time.