1. Why is Blastoise not A Rank? It's the best RapidSpinner in UU and is often a key player in a lot of teams. Blastoise's indifference to a lot of spinblockers is present in its stellar movepool, which can Scald or Toxic a lot of the Ghosts in the tier without so much as a care.
Blastoise is really only scared of Roserade in terms of hazard setters/Pokes, and a lot of Pokemon are scared of Roserade in general.
2. Why is Ambipom not in E Rank? I tried using this in early Gen V UU (back when I tried to use Gen IV Pokes in the tiers they were in originally) with predictably disastrous results. Weavile and Mienshao are both infinitely better at revengekilling and hit-and-run, respectively. Most teams almost always have an Ambipom counter, too; to do so is not hard at all.
Ambipom's uselessness in UU is also a common topic among many discussion groups, moreso than Dusclops. What makes it good enough to be in C Rank, pray tell?