The Myrmidon is not the uberfighter tech room makes it out to be. It's actually slower than the GTF Ulysses on afterburner, and what they don't tell you about those three secondary banks is that the first two are very small. It can't carry the signature dogfighter's missile, the GTM Harpoon, but it can make use of all three of the primary dogfighting cannon: GTW Subach HL-7, GTW Prometheus S, and GTW UD-8 Kayser.
It does, however, have a problem in the primaries department. While the Myrmidon actually has six guns, granting it some serious firepower, their configuration is sub-optimal for dogfighting and hitting with the upper four guns requires some ignoring of the "Aim Here" aid. As an aside/general oddity, the Myrmidon is actually capable of carrying the GTM Helios bomb. It has enough space for four of them, giving it a considerable threat to poorly defended capital ships.
This class of fighter is ideal for those who prefer balance between firepower, strength and agility. The secondary weapon capacity equals with the Perseus with some compatibility differences. While the Myrmidon is unable to carry the Harpoon, the player needs to be better with primaries than secondaries. The six primary guns will help players with these preferences. The first and the second bank are ideally armed with GTM Tornadoes and the third with GTM Tempests. The second bank is not the best with Tempest because of the location of the firing points. Players might prefer this fighter for tactical runs as it is compatible with the GTW Akheton SDG anti-subsystem cannon. If you arm it to the first primary bank, you still have the second bank, which has four firing points to arm with the GTW Prometheus S.
Jack of all trades, master of none. And that saying is no more present in any other fighter in FS than this, although it does have some advantages, such as a large number of gun points, compact profile, and the ability to carry the Helios, but it is also lacking in compatibility with quite a few essential weapons, it has small secondary banks (despite having 3) bringing the missile loadout capacity up to the GTF Perseus and that adds up to an incapability to do anything PARTICULARLY well. Emphasis on the particularly. If this was the bulk of the fighter force for the GTVA I'd be fine with that.
The Myrmidon is actually a reasonably capable fighter, its only really important flaw is the lack of GTM Harpoon capability.
The Myrmidon sounds good on paper, but in the field, the Myrmidon is one of the worst fighters in the game. It may be fast, but its maneuverability is closer to that of a bomber than a fighter, worse by far than the Ulysses or even the Apollo. Its primaries are placed poorly for dogfighting, especially the top four, which are the ones you would normally be relying on in a six-gun ship anyway. The missile bank capacity is average at best, and it does not carry the GTM Harpoon, a fatal mistake for a dogfighter. Its target profile is absolutely enormous from any angle, and its huge engines shout "I'M RIGHT HERE! SHOOT ME!". My best guess for the optimal role of this ship is as a fast-attack fighter. Load it up with GTM Tornadoes, crank the engine power, and unleash flaming death on freighters, transports, gas miners, and other weak ships, and then get away fast before the escorts swarm you (let's leave aside the mysteriously present Helios capability, which is tantamount to cheating). Once you get the Perseus, you will never fly the Myrmidon again, except in the SOC loop where you must fly it.
The Myrmidon is an excellent fighter, people just think of it as the successor of the GTF Ulysses which it isn't, really. This fighter is much more in the vein of the GTF Apollo. It's maneuverability isn't really that bad, and those six primary shots will chew through anything very quickly. These fighters are more adaptable than the GTF Perseus, with three missile slots rather than two this fighter can carry a more varied load out, and changes to the ETS system of this ship dramatically change its abilities. If you need to defend a corvette, than attack a cruiser, then maybe take out some turrets on a Hecate, and maybe dogfight a few Dragons this ship will serve well, if you were just planning on doing any one of those things, there's probably a better fighter for the job.
A useful strike bomber. A wing of Myrmidons equipped with Helios torpedoes will pose a fearsome threat to any ship beneath destroyer class. It's secondary gun bank of 4 guns gives it a dangerous edge in dogfights.
Strange thing, the Myrm. It can carry warheads (Helios) that are almost the size of the ship itself.
this is a horrible ship, it has a mid sized target profile, at best average amour and shields, and not enough maneuverability to make up for it, so on missions like ...But Hate the Traitor, you are playing Russian Roulette to survive