I re-watched this episode finally to make a direct comparison with the "new" Swarm called The Krall in ST:Beyond. I've never seen this episode more than once (which is rare), and what I found after all these years was a story that had problems endemic to the Berman era Trek, but particularly Voyager.
The episode starts out with an overlong teaser involving the budding relationship between Torres and Paris. It hasn't quite gotten there yet and it's rather awkward, until they find energy readings they are looking for..it turns out the readings are of a stealth enemy and they inexplicably appear, stun them and leave. Not much of a teaser..but the aliens are more elaborate than usual and surely they will lead to some grand new intrigue in the Delta Quadrant? Wait no, scratch that, the EMH is having memory problems and we all know the producers in the Berman era want to focus on characters, so THIS must be the main story right? Well that's the issue. This A and B story pattern doesn't always work, and was started in STNG to make the drama and "out there" scifi elements more accessible and grounded. Here it does not work well.
Peekaboo
Fighting it's way leisurely to get out is an alien race that according to Berman was supposed to replace the Kazon, and substitute for the Borg, whom we all thought would realistically be the main villain eventually. They barely register at all. Why did they fail?
I can think of a few things. One, despite very detailed suits and makeup, they aren't all that memorable. Their language consists of muffled utterances that can't be read by the universal translator. An unfortunate decision. We never really get to know them. Two, the the CGI ships were not up to snuff. They were unique in Trek history, with perhaps only the Borg (a swarm of sorts) and the Tholians (they swarm and web their prey in) as analogous. The direction and VFX work were just not up to the task. Third, they were really not the focus of the story, IF they were, then this might have been the new "villain" of Voyager, but they were not treated as such by the writers or producers...half-hearted at best. The Swarm problem..well, turns out all those ships are linked (what??) and easy to technobabble away. Design flaw much?
There is a mildly entertaining story in it's place, the Doctor actually comes across a problem with his original design not being able to handle his development as a full-time conscious entity. This is certainly interesting, but once again, Voyager is the king of technobabble, and the resolution is not as interesting as it could have been.
Fast-forward to 2016. The Swarm, later known as The Krall..once again it appears they are a species that is xenophobic, though in this case, they appear to have a spokesman in Idris Elba's character. Their very existence is meant to be a challenge to the expansion and reason for being of the Federation. This remains to be seen, but now the focus is on The Swarm..their ships are not like parasites, as in Voyager..they are designed like a ramming missile, disintegrating a vessel piece by piece. This swarm tactic is not a unique idea but a very rare one in Star Trek. Something certainly not seen on a big budget in a ST movie. It finally seems that the idea has been done right, and we have something truly alien beyond a usual Klingon and Romulan or genetic superman.
The face of the enemy:
The episode starts out with an overlong teaser involving the budding relationship between Torres and Paris. It hasn't quite gotten there yet and it's rather awkward, until they find energy readings they are looking for..it turns out the readings are of a stealth enemy and they inexplicably appear, stun them and leave. Not much of a teaser..but the aliens are more elaborate than usual and surely they will lead to some grand new intrigue in the Delta Quadrant? Wait no, scratch that, the EMH is having memory problems and we all know the producers in the Berman era want to focus on characters, so THIS must be the main story right? Well that's the issue. This A and B story pattern doesn't always work, and was started in STNG to make the drama and "out there" scifi elements more accessible and grounded. Here it does not work well.
Peekaboo

Fighting it's way leisurely to get out is an alien race that according to Berman was supposed to replace the Kazon, and substitute for the Borg, whom we all thought would realistically be the main villain eventually. They barely register at all. Why did they fail?
I can think of a few things. One, despite very detailed suits and makeup, they aren't all that memorable. Their language consists of muffled utterances that can't be read by the universal translator. An unfortunate decision. We never really get to know them. Two, the the CGI ships were not up to snuff. They were unique in Trek history, with perhaps only the Borg (a swarm of sorts) and the Tholians (they swarm and web their prey in) as analogous. The direction and VFX work were just not up to the task. Third, they were really not the focus of the story, IF they were, then this might have been the new "villain" of Voyager, but they were not treated as such by the writers or producers...half-hearted at best. The Swarm problem..well, turns out all those ships are linked (what??) and easy to technobabble away. Design flaw much?

There is a mildly entertaining story in it's place, the Doctor actually comes across a problem with his original design not being able to handle his development as a full-time conscious entity. This is certainly interesting, but once again, Voyager is the king of technobabble, and the resolution is not as interesting as it could have been.
Fast-forward to 2016. The Swarm, later known as The Krall..once again it appears they are a species that is xenophobic, though in this case, they appear to have a spokesman in Idris Elba's character. Their very existence is meant to be a challenge to the expansion and reason for being of the Federation. This remains to be seen, but now the focus is on The Swarm..their ships are not like parasites, as in Voyager..they are designed like a ramming missile, disintegrating a vessel piece by piece. This swarm tactic is not a unique idea but a very rare one in Star Trek. Something certainly not seen on a big budget in a ST movie. It finally seems that the idea has been done right, and we have something truly alien beyond a usual Klingon and Romulan or genetic superman.
The face of the enemy:



