Well, Escavalier is an obvious one that stands out. I don't recall seeing any serious players actually using it, and I question what niche it could have over (Mega) Scizor and stuff, but it's C Rank. I'm not a huge fan of Sharpedo in C+ rank, not sure why Meloetta is ranked, etc. I'm okay with most stuff there, Mantine's the big one really.
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Agent Gibbs
trc
Agreeing with all of these, I think Escavalier is a cute check to random frail special attackers that don't take up a Mega slot whereas I've already pushed (internally) for Sharpedo to move down. Meloetta is a decent-ish Aegislash check I guess. Nothing really special, I'd thoroughly recommend you make a post on the things you would like to see dropped.
Agent Gibbs
Yeah, I'll probably make a more formal post later, mainly regarding C and D stuff since those tend to get ignored in favor of S/A/B rank discussion.
trc
Me, alexwolf and Nog have been trying to revamp the C Ranks lately because some of the stuff is obviously inaccurate. Here is my post regarding them which may have been lost: http://www.smogon.com/forums/threads/xy-ou-viability-ranking-thread-v2.3502428/page-153#post-5570107