Actually, several people have addressed your question, including myself, but they've been buried under everything else.
I think the problem here is that you exaggerate how much better things have become. Things have become better, slightly but, just like more than a year ago, Metaknight still has a huge lead over Snake who inturn has a huge lead over the rest of the cast. As the Amazing Ampharos showed earlier, Metaknight has almost triple the amount of placings when it comes to major tournament placements this year then the second closest character, Snake. The both share 4 wins apiece but, for everything else, Metaknight still leaves everyone in the dust.How is that not proof that this game is still a game that is essentially focused on beating one character?
I want to know how this game is focused on beating MK. Seriously. Is it something that matters to a lot of characters? Yes. But match-ups against high-tier and especially the best character in any game are important, and they're things you want to explore very deeply. In any game. You'll find this to be true of any game.
What tournament placings are you looking at, specifically? Ankoku's character rankings list is nice and all, but it isn't very specific. Various factors like other players and characters at attendance, regions, weight, "largeness", players themselves, etc., factor in as well.
You speak of match ups becoming closer but, seriously, this has been happening since the game came out. One character would find something that works against Metaknight and then Metaknight players quickly find something that counters. Since the game has been released, we have had a decent people say at one point in time that Donkey Kong, Wolf, Bowser, Shiek, Yoshi, Diddy Kong, Zero Suit Samus, Falco, Ice Climbers, Wario, and Snake have all been Metaknight counters. Where are all these characters now? Where are all these "saviors" to the metagame? Most of these characters were quickly countered simply by counterpicking stages ontop of strategies being found to counter the anti-Metaknight strategies. Even then, the only character that hasn't been fully worked around at some point is Snake. Diddy Kong has been claimed to be a potential counter since last summer and the Ice Climbers can be just as easily stage counterpicked or ledgecamped (hey, if Pikachu can easily ledgecamp the ICs then Metaknight certainly can do the same). As expected, since Metaknight has not true counters this has been a really slow process especially since everyone else does have counters.
Counters=/=bad match-ups.
A disadvantageous match-up is different than a counter. Would you call 55:45 a counter? Would you CP Wario that you don't use much to beat a really good Diddy Kong, and actually expect to win?
Wario doesn't really have counters. His bad match-ups are D3 I think, MK slightly, and Marth by some margin. But you can't expect to counter a Wario with Marth; you'd have to actually invest a lot of time into the character to beat a good Wario.
Snake doesn't really have counters, nor does Wario. Just bad match-ups.
Whether or not one of his match-ups was considered even a long time ago doesn't matter to what it is now. As far as my knowledge goes, Diddy vs. MK was thought to be 6:4 MK back in August, now it's thought to be at worst 55:45 MK, and Diddy has known techs that aren't used much that could help him quite a bit in the match-up.
Also, you have to consider the mid-level of competitive play too where Metaknight is more dominant and more people have quit Brawl due to him. If anything, there has been evidence that this is increasing despite the lead Metaknight having over Snake slightly decreasing. As several other people said, the mid-level of play makes the high-level of play even possible so if a decent number of people in the mid-level of play leave, it definately hurts the high-level of play.
I'm going to honestly ask, why is MK more dominant in the mid-level of play? Is this something you just threw together, or do you have concrete proof to back up the claim that, "You have to be REALLY good to beat any MK?"
As Tyr said, in the Midwest region, we've seen Shugo beat Overswarm twice in money-matches. Nope won a 30ish man tournament with two great Ohio MKs. Krystedez, a Wario main from Indianapolis, just recently went to a Chicago championship tournament and beat 3 good MKs, Sago, Fatboy, and Bowyer, losing to Judge and Anther.
Who's a notable player that quit Brawl due to Meta Knight? Or any player anyone's ever heard of? How does Meta Knight dominate at mid-levels of play? It sounds like this was just some made up "fact" thrown into the argument that nobody bothered to correct.
As myself and others have said, under competitive ideals, Metaknight should not be banned simply because he doesn't have counterpicks. The difference though is that Brawl is a more shallow game than most popular fighting games and the metagame as a whole has mostly slowed to a crawl. Basically, we have a slow developing game that is still riddled with a lot of "gay" elements. We have jab locks but those can be prevented by counterpicking. We have chain grabs, grab releases, and infinites but those can be prevented by counterpicking. We have various forms of camping but, again, those can be counterpicked around. In the end, we are left with one thing that makes the game look bad and greatly lowers its appeal but can't be counterpicked, Metaknight. I personally believe that keeping Metaknight will overall greatly shorten the life span of this game because of the reasons I've already said in this post and how his presence prevents more diversity by keeping 5 characters from becoming viable and 4 from being more viable. Again, if Brawl wasn't so littered with problems already and was more like Melee in terms of "competitiveness", this wouldn't even be an issue but, sadly, that's not the case.
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Which five characters does he make unviable, which four does he make less viable?
I can think of characters that he makes LESS viable, and I can think of otherwise really viable characters that he makes less viable, but they're still viable enough.
Also, this counterpicking argument is bleh, because it's assuming that
1) Counterpicking characters is a strategy often used in high, and even medium levels of play.
2) Even match-ups or even better match-ups don't qualify as being counterpicks, even though you're still improving a match-up more in your favor (example, assume I have a really really good Snake and a really really good Diddy, neither of which I actually have. I've heard judge and ksizle both say that they have Diddy weaknesses, and I'm more likely to play Diddy against them. Dojo secondaries Diddy and probably knows a lot more about him than most other MK mains, so I'm more likely to use Snake).