The writer of "Squadron" has a good grasp of the Dominion War story arc. As far as I can tell, through the veil of the Czech language dialogue, the acting is pretty good. I thought Jana Peclova as the Vorta, Inrina, was overacting a bit and Jakub Holý as Captain Viktor de Santis was, possibly, underacting. Michal Husak as Adm. Jens Nansen though got it just right and has real presence. If the world were fair, Husak would have a great future in the international cinema. The world being what it is though, who knows whether he'll ever be a star of anything except Czech soap opera.
The initial battle between the Norway-class destroyer and the four Jem Haddar fighters struck me as unrealistic but people with less of a geeky interest in the Star Trek universe will probably not be bothered by it. The second battle was genuinely interesting and well thought out.
Among the Starfleet characters, there were far too many females in command positions to be realistic as the Federation is not a gynecocracy. Otoh, making three of these women non-humans was realistic as the Federation is supposed to be a close alliance of multiple species, not a human empire. The big network shows have chronically spaced out this aspect of the Star Trek universe.
Bottom line, if you're into Star Trek, "Squadron" is worth a half-hour of your time. On the IMDB scale, I rate this as a '7'.