I think this episode has a few problems.
1) The whole cave setting was kinda cheap.
Why not show a bigger underground structure they were defending (a matte too perhaps).
When there are "real" soldier dramas using beautiful location shots like "Thin Red Line", it makes it all the more obvious "AR" is a bunch of guys in piyamas fighting dudes in rubber masks with plastic toy guns.
Just compare that to "Nor the battle" or "To the death".
In TTD we had those ancient iconian structures, in "battle" you got a glimpse of an underground starfleet installation (plus location shooting). Here, we just have the standard DS9 cave. Also a missed opportunity to show some real cool Starfleet hardware like those hoppers or gunships (or Mechs

).
2)Future combat
I don't buy the combat in this for a second. They don't have drone guns (that would take care of the Jem'Hadar in a second)? Grenades? Force fields? Auto lock-on?They use single raygun shots instead of broad beams, that would incinerate the attackers.
If there was a moment to talk about possible rules of those future wars, this was it. But you can't really have that, if the Jem'Hadar use the Houdinis and their personal cloaks and ammo that leaves an anti-coergulant. So why would Starleet constrain itself?
I realize this was for the sake of looking cool and more akin to today's combat. But considering this is THE strategic important place to hold in this conflict, they should have the hardware. If they needed to have this kind of fighting, they should have tried another setting, like a random squad being pinned down in a jungle or something.
Space:AAB had similar, but better, depictions of future combat long ago.
3) what was the point of it all? We didn't see 24th century combat, the setting was forgettable, humans can get pretty ugly after some weeks in the trenches (who would have thought?)
"Nor the battle" is a much better Trek war episode in my opinion. Jake running away, the soldier shooting himself, Starfleet triage. That was powerful.
A bunch of Starfleet soldiers in a cave? Not so much.