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It's really not "good" at all lololol. It wins vs decks where Level 5+ Special Summons are the game plan because it tells them "you can't play YGO". Against decks where Ophion isn't relevant? It's an uphill battle, almost always. The OCG had Evilswarm long before we did and it was never played for a reason, that reason being Ophion did nothing to the top decks at the time. It wasn't until Dragon Rulers and onward that people started paying them any mind. Why? Because Ophion was relevant, but even then there were still answers to it, and the hype died out.
Looking at the current format, the top 4 decks are arguably H.A.T. and it's variants, Satellarknight, Burning Abyss, and Shadoll. Bujin, Madolche, Sylvan, and Geargia variants would be runner ups for most represented, then pretty much everything else. Out of all of those contenders, Ophion is relevant against a whopping two of them (2.5, if you count the Karakuri Geargia builds), and both have main decked outs to Ophion. If built right, YES, it can have better matchups vs decks where sitting on Ophion isn't an option (i.e., main decking Vanity's Emptiness) but that only goes so far, and it isn't far enough. It's not difficult to see why the deck isn't being used, and why it only tops once in a blue moon. It's just simply not very good.
As far as Evilswarm goes in relation to itself, I largely disagree with you - Infestation Infection is far from being one of the best searchers in the game, but it is definitely the one which carries the biggest risk vs reward factor. Being able to put dead cards like Heliotropes and excess Thunderbirds back in the deck to search combo pieces like Castor or Kerykeion is the nuts, but for one it's a Trap and therefore slow, and two it's a Continuous Trap which means it's highly vulnerable to MST/Artifact Ignition/Double Cyclone/Raigeki Break/PWWB/Sanctum into Moralltach and MANY other forms of Chainable removal which will cause the Evilswarm player to eat a nasty -1. The deck doesn't necessarily have one of the strongest Rank 4 "engines" as much as it has one of the strongest Rank 4 CARDS, which is Kerykeion. Other than that, it has a themed Goblindbergh which isn't anything extraordinary. Honestly the BEST non-Ophion/non-Kerykeion standalone cards they have are Thunderbird (absolutely amazing card overall), Pandemic, and the ability to use Exciton Knight with deadly accuracy due the the latter.
The deck is hardly meta, it doesn't have even a fraction of the top cut showings it needs to be considered "meta". It's a meta call at best, and Steelswarm isn't really "rogue"...it's more like nonexistent, lul.
I mean, you don't have to agree with me, you're entitled to your own opinion and whatnot, but the facts don't lie.
(Sorry for the novel. Meant to type a thorough response and ended up writing Moby d**k.)
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