Originally Posted by Fat Meru
This is unlike Nidoqueen, who is not fueled by unpredictability, but instead, is fueled by sheer force.
A small nitpick here, but I've seen arguments like this a lot. The issue with Nidoqueen is not her "Sheer Force" (although I do appreciate the pun). 95 BP STABs off of an adjusted 112 Special Attack, while good, does not match the power of Moltres or Magmortar, who boast 120 BP STABs off of a base 125 Special Attack (which is only slightly lower in the whole Timid vs. Modest thing).
Where she does excel though, is in her coverage. She can 2HKO so many of her checks with the appropriate coverage move (Cryogonal? Fire Blast; on-site Slowking? Tbolt). She also has just enough of everything else (Speed, bulk, resistance to residual damage, etc) to make checking her much more difficult.
I'm running a hail team right now that happens to have a couple solid checks for her, so I don't mind her too much (everything on my team 3HKOs at worst, the rare problems come when I try and lay Spikes). However, I've heard non-hail teams have a harder time, and since they are a significant majority, I don't feel like I have the expertise necessary to dictate a ban/no-ban.