Both are much weaker than the terran campaign. Unhappy Anchovy's analysis judged the protoss campaign as the weakest, but I was biased because I always liked the zerg more.
The problem is that the campaigns were written as plot-driven rather than character-driven (i.e. characters act to advance the plot rather than whatever makes sense based on their characterization and the circumstances they encounter) and Metzen clearly didn't know how to get the plot from point A to point B. Thus we ended up with a much worse plot than we otherwise would have if Metzen didn't have to follow such obvious mandates.
We can see this by comparing Insurrection, which is noticeably better plotted. That does not make it good by any stretch, as the developer clearly had no budget and no understanding of map design. It is just better plotted because it did not suffer the same tumultuous development as Episodes 1-3 did. An amateur writer got the manual and license from Blizzard and spun a plot from that.
So trying to argue from hindsight is pointless because the plot doesn't make sense anyway. The psi-emitter is a blatant plot device and the zerg conquer planets because of writer fiat rather than any actual work on their part. The setup in the manual is cliche as hell, but it wasn't completely terrible and could have worked in the hands of a better writer. Metzen clearly wasn't cut out for that and he wrote a terrible implementation of what he was given to work with, assuming that the manual was even finished when he wrote the script (and it probably wasn't).
If I had to rewrite the story, I would take into account that the manual stated Tassadar promised never to glass another planet and that the zerg were looking to assimilate humanity's psychic potential and had to do so subtly. So Tassadar wouldn't glass planets and the zerg wouldn't steamroll all opposition.
Trying to figure out how the Battle of Chau Sara went down in a rational universe is enough of a challenge given all the conflicting information about it, I don't need plot contrivances turning the story into a farce.
Speaking of the psi-emitter, I can't work it into any kind of rational plot without adding additional contrivances.
Rationally speaking, the psi-emitter is a glorified signal beacon that broadcasts on psychic channels used by the zerg. It doesn't seem to be detectable to terrans or protoss unless they are specifically listening on the same channels (telepathy seems to work on similar principles to radio, including having different channels).
Now, if the zerg are in the sector to harvest psychics in mass like they've done for every other species they've encountered, why would they sent such large detachments to investigate a beacon? We know they understand the concept of beacons because they used beacons to signal both the Gargantis proximae and the unspecified Behemoths to meet with them.
Liberty's Crusade (which plugs some, but not all, plot holes in Episode 1) still has Mengsk speculating that the Confederacy lured the zerg with psi-emitters while knowing they are actually aliens rather than a Confederate creation. This leads me to suspect the possibility that the zerg's deep space probes might very well have been lured by some precursor to the later psi-emitter experiments. I'm not a professor of meta-neural study, but it sounds perfectly reasonable to me that if you discovered telepathy that operated on similar principles to radio then you would explore its applications for long-range communication including FTL where possible.
The zerg should be aware of the Confederacy's experiments on them as well, considering their species-wide telepathic network. If zerg are being abducted by terrans, they should logically have some memory of that occurring. From there it makes sense to investigate what the terrans are doing.
So when the First Contact War starts in a rational universe, the zerg should be aware that the Confederacy created beacons that broadcast on psychic frequencies. Why exactly would they waste unnecessary amounts of resources investigating a trap they used themselves when they could be harvesting psychics from populated areas?
The explanations I've heard or devised myself are all unsatisfactory:
- Investigating obvious beacon just because
- That particular message is a telepathic binaural beat (i.e. alien catnip)
- The signal obscures individual psychics, like fireflies against the sun
#1 isn't an explanation at all. Even if it would make sense to investigate unknown signals, that doesn't justify huge expenses when you don't even know what it is.
#2 is implausible because binaural beats cannot replicate the effects of chemical drugs. It might be possible to transmit a virus or prion through zerg telepathy by taking advantage of the fact that they transmit genes telepathically. However, the xel'naga already had that capability through their psychic link with the zerg and the zerg later adapted around that danger so it is clearly not that reliable a vector.
#3 raises even more issues because it is jamming specifically terran psychic channels. Not only should it obscure terran psychics from the zerg, but also from each other. It might even obscure reading the minds of non-psychics too.
These problems come into play because I am thinking about psychic powers rationally. Not in terms of modern science, but in terms of them having consistent rules to avoid contradictions. The rules as I have figured them just operate analogously to radio.
One of the implications of a rational universe is the concept of arm's races. What this means is that no weapon is unstoppable and no defense is impenetrable. Thus, opposing forces constantly have to race to produce better arms and armor.
Anything that is functionally unstoppable/impenetrable has drawbacks which come into play if both sides are equivalent. This includes nuclear weapons and sensor jamming. A nuclear war will destroy both sides. Sensor jamming goes both ways, because blinding your enemies' sensors will blind your own on the same channel.
And I haven't gotten started on other applications of radio like the difference between active and passive sensing, target painting, and so forth. (The scifi series The Expanse regularly uses these concepts.)
Which also reminds me... if the primordial zerg evolved "psychic sensitivity" (i.e. telepathy), then does that mean they could detect minds (or at least nervous signals like sharks and electric eels do?)? I mean, that would come in handy if you are trying to find a host's central nervous system or something.





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