I never claimed that Milotic was broken, and while I generally agree that that is a horrible argument, there are some cases where a pokemon that counters a broken pokemon isn't broken itself. For example, Umbreon counters Latias. Are we going to call Umbreon a suspect simply because it beats Latias? That is silly. Now, recognize this isn't a perfect example, but you get the point; A pokemon capable of countering a broken pokemon isn't necessarily broken. Is Chansey broken because it keeps Moltres from definite suspect status? I also don't plan on using that as my argument for my paragraph. It was not meant to be a logical conjecture, and I apologize for the slippery slope aspect of it.
@FlareBlitz, I also didn't say it walls a significant portion of the metagame. It is rather the best counter to some top-tier threats. Aaanyway, I agree that ultimately beating these walls comes down to teambuilding. It isn't like Milotic is comparable to Cresselia, which had almost nothing that could switch into it and could use the massive bulk to set up calm minds. It is purely a defensive threat, can be broken by several of the offensive powerhouses of the metagame that it is supposed to counter (Moltres, Azumarill can get the 2hko with some hazards, Rhyperior, Aggron can ohko with some prior damage, etc.), is countered by the huge amount of grass types in the metagame (whether it is the cause of this or not is difficult to establish). It could be argued that the suspect status of every new grass type to come along is part of the reason Milo is so good.
The metagame seems quite balanced right now, and I think that removing any of the current suspects would increase the need for the rest of them to be removed, and might bring up a lot more suspects. I hate to go slippery slope, but we might have to ban 5-8 things to establish a metagame with any semblance of balance if any of the current suspects are taken out. Rhyperior is partially kept at bay by the Venusaur/Milotic cores that exist right now. Likewise Milotic is hindered by the ever-present Venusaur (and Toxicroak too, but w/e) and the other grass types. Moltres (hell, even Houndoom) would become much worse without Milotic to keep it in check (Chansey is not something that every team wants to commit to). The banning of Milotic and Venusaur might also cause a wave of Rain Dance-related bans, because Kabutops would certainly love to see one or two of its common checks get banned, as well as a decrease in Toxicroak usage after the Milotic ban. My point is that if the metagame is currently balanced by some of the more powerful members of UU, why can't we simply let it be instead of maybe banning 1-2 of the suspects (I doubt all of these suspects have the proper support currently) and then having to go through multiple suspect rounds to find balance again? With the metagame constantly producing a new Grass type to be #1, it is conceivable that we could be back to square one AGAIN if Exeggutor or Sceptile rise in popularity to take the place of Venusaur, Roserade, Shaymin...Are we gonna nominate the new hot shit grass type every time?
Ultimately, the fact is that the top pokemon are all capable of breaking through their checks (or walling tons of shit) and causing general chaos. The entire top echelon of pokemon are "broken" under the characteristics we have. Honestly the characteristics we have are shit anyway. A theoretical pokemon that beats 47 of the top 50 but loses to the top 3 would be considered broken under these parameters, which is rather ridiculous.
My greatest problem has always been fitting all of my thoughts into one reasonably concise paragraph, so I apologize if some of this is incomplete or incoherent or something.