User blog comment:Atmey/PBE Karma impressions/@comment-7006769-20130331200044/@comment-3529242-20130402051350

Comparasion is the only way to know how good (or bad) a certain thing, you can't call X champion OP without comparing him with anyone, I compared her to mid laners as it is her new main role. What if an another moba game X person does 500 damage on 5 seconds CD, you would say OP if you compared it to lol, but in that moba game the average is 750 and AA deals 300 damage per second without items. You must compare.

Orianna offers AoE MS boost and slow, single target shield and resistances, plus AoE hard CC along with a spammable damaging ability.

Karma's RW is not a "heal" it is a self heal, you can't heal others, you should compare it to something like Vlad's Q or Morde's ult (without spellvamp) or maybe Morgana's passive spellvamp.

Orianna and Lux offer more utility and damage, and they can combo their abilities which is Karma is lacking too.