I watched this Ova after i watched two of the later seasons of Strike Witches. And I was pleasently surprised.
Story 7/10
Although the story is rather short, there are many things explained in details, which I didn't see in the longer anime show. Finally a load of new things actually started to make sense to me. The weapons, the places. Finally something more then just ridiculous amounts of shear fanserwis and nothing else. It was actually a good introduction to the universe and my view about Strike Witches has changed. I am willing to check out the manga and novels now.
Art 6/10
The art is worse then the anime series, but it doesn't mean it's bad. It's pretty, gives a wibe of WWII at times and there are featured many interesting images.
Sound 7/10
The sound was good, it fit well with the theme. Nothing epic to go crazy and start getting mp3's of this, yet still quite satisfying.
Characters 8/10
The characters were shown fine for such a short amount of time. I was pleasently surprised about Major Sakamoto especially.
Enjoyment 7/10
This was actually pretty enjoying even compared to the longer anime series, the fun is balanced with the interesting facts well, but at the end a few parts just get slightly annoying.
Overall 7/10
This wasn't as bad as I expected this to be. This OVA might be my first step to stop my Strike Witches hate and a step that just invited me to an exploration of a whole new experience as I have higher hopes for other works now.