User blog comment:BlitzerRyuusei/Rating supports by their poke, sustain, and burst/@comment-2094543-20131010144832

For the fourth category, I suggest something like peeling/kiting/counteriniation/kiting instead of CC.

CC's purpose is too varied to rate it by raw durations/effects - Leona's and Blitzcrank's CC primarily serves to secure kills (I'd include that in the Burst category, and I assume you did the same, considering Leona's burst rating), while Lulu's and Janna's CC is mostly peeling-based, and then there's champions like Nami, Zyra, Alistar and Thresh who do both equally.

Utility is kind of a vague category too, but things like vision and global influence should probably be covered in some fashion.

By the way, I would be happy if you added Nunu, Morgana and maybe even some unusual supporters like Gangplank, Ashe, Zilean, Lux or Maokai.