OK valid point.This is usually true, but it's not the right question. The issue is the gap between the best option and the other options.
However TTars Dragon Dancing abilities are just as capable as mence with MUCH better bulk, and an immunity. As are his hole punching abilities. The only thing that seperates them is speed. Which is fixed with priority handling Mence, on that not, why do people complain about having to use priority or a bulky water for Mence, both of those are very viable with or without Mence.
Mence is also predictable. The first time they come in it's either Dragon Dance or Draco Meteor, unless you've shown then Scizor or Heatran then you shouldn't be swithcing them in anyway. It may be hard to counter but it also doesn't counter anything, unless it comes in on a grass/ground movec or a bulky waters Surf/Hydro Pump, then it has 0 survivability especially with SR and LO taking 35% away for a switch in plus the ever prevalent SS so it in a fashion works as a revenge killer that has to be revenged. Even with Roost that is hard to work around. I am not trying to insult anybody BTW. I am merely voicing my opinion on the matter.
/Rant
And on the tiering process.... I think it was decent. It didn't take all of yesterday to do and it still allowed to public to (try to) participate. No matter what decision they came to on how to tier it, mass vote, council, suspect test like Lati. Some group of people will be unhappy. You can't please everyone and I also think this is a product of Pokemons luck factor like team match ups, even hax plays a part (I'm not using this as an excuse for Mence) like a crucial miss with Stone Edge or Fireblast.