I don't think I can quite agree with you. Rotom-N is an excellent choice in many situations to be sure. That's why it is A rank. Is it really any better than Sigilyph or Drapion or Tangrowth? I wouldn't say so.
With the changes to the "definition of D rank" these are my opinions on most of the recently suggested changes and some of the added possible Pokemon.
Whimsicott UP from C rank to B rank
Magneton stays in D rank
Hariyama stays in D rank
Rhydon Down from B rank to C rank
Rotom-N stays in A rank
Primeape stays in B rank
(just because it isn't used much doesn't mean it isn't decent. Resisting SR, and having access to encore and U-turn give it fairly reliable roles on a team and it's pretty hard to directly shut down)
Glaceon goes to D rank
Leafeon goes to C rank
Vileplume goes to C rank
Lunatone goes to D rank (not sure it really even needs to be here)
Kangaskhan goes to B rank
Lickilicki goes to C rank
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other additions I think are reasonable
Seismitoad goes to D rank (slight niche for Rain teams)
Shiftry goes to C rank (with a SD under the sun, this thing wrecks house)
Sawk goes to C rank (pretty good Choice Scarf user with certain team comps)
Raichu goes to D rank (its usable, Encore NP can go along way with 100 Base speed)
Cradily goes to C rank (one of the better Curse users available in RU honestly)
Musharna DOWN from B rank to C rank. (Sigi does offense so much better and both Clefable and Miltank are better for the defensive role)
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lars: scolipede is such an under rated lead
DiscoLord: it eats cyanide and shits fucking acid
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O.o <--- that is all I have to say
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