Yeah, I'm not quite sure I like Nidoqueen in the tier so far either. Even though I'm a relatively new RU player I feel like it can come in and threaten everything that is slower than it out, which leads to really unpleasant prediction games. Full-stall feels almost neutered (although I am an offensively oriented player) due to Nidoqueen and it is easily the scariest Pokemon in the tier when it comes in on anything slower than it. Even if you have a check like LO Aero, it can't even really switch-in with impunity. Nido wears down quickly and has mediocre speed, but I feel like it makes this tier more offensively oriented.
I'd love to see which Pokemon I haven't thought of though ^_^ but I don't like Nido here either.
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