Having to pull out Mandibuzz and Sableye is not working in Aegislash's favor. Nobody is saying there aren't any counters to Aegislash. A Pokémon is not defined an Uber because it has no counters. The rest of your argument is arguing about how Aegislash won't perform well in Ubers, which is completely irrelevant as well. You don't see many MegaLuke's running around in Ubers, well we obviously shouldn't have banned it guys. You ban Pokémon based on the metagame they are in, not the metagame they'll be in after the ban.Aegislash is so easily countered it's Laughable. The physical variants are shut down easily by Sableye, albeit Sableye is rare, Prankster Will-O-Wisp is a hard counter to it. Mandibuzz is also a hard counter to Aegislash as well, considering it resists it's Ghost Stab, and can Roost and Foul Play spam. Special and Mixed Variants are harder to counter, but fast ground types, normal types with Ground/Fire/Ghost moves stop Shadow Ball in its tracks. Sub+Toxic Aegislash is beaten by Steel Types, namely Heatran and Excadrill. Aegislash is in no way broken. While it has fantastic everything, it's not hard to find a direct counter to all of the sets it commonly runs. Also, I think Aegislash will be absolutely wrecked if it is banned to Ubers, having to share the battle grounds with the likes of Mega Gengar, Blaziken, Kyurem B, Groudon, and Ho-Oh to name a few. Sashed Deoxys-Attack can live a Shadow sneak if it's sash isn't broken and kill with a Dark Pulse or Knock Off. Mega Gengar takes an unboosted Shadow Sneak and kills with a Shadow Ball. (calcs) 252+ Atk Aegislash-Blade Shadow Sneak vs. 4 HP / 0 Def Mega Gengar: 194-230 (74 - 87.7%) -- guaranteed 2HKO (against MAX Specially Defensive Aegislash, never seen) 252 SpA Mega Gengar Shadow Ball vs. 252 HP / 252+ SpD Aegislash-Shield: 174-206 (53.7 - 63.5%) -- guaranteed 2HKO after Leftovers recovery. There is no reason why Aegislash should be banned, as it will be easily outclassed in Ubers and isn't broken in OU as it is. I think people are calling for this suspect test since they are just tired of being outplayed by people who are good with Aegislash and losing to it, while they get beaten when they use Aegislash. I vote against banning Aegislash
Not to say it isn't true that Aegislash is bad in Ubers, it has certain niches and can actually perform pretty well.