"Zed could STAND to be stronger right now, his burst is GOOD but we're giving him power ELSEWHERE"
Meanwhile

Since I have nearly 300 games on Camille, I'll comment personally on her weaknesses.
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Ult has a stupidly high cooldown still at early ranks despite being made into a glorified fizz E until rank 2.
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For a diver, she really has no way to survive in the midst of a fight since her sustain was chopped on her W.
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Low base health scaling leads her to be less tanky than you'd expect for a diver in the later stages of the game (Rengar has more health than her...)
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High mana costs early game render you unable to trade with your opponents more than twice before going OOM.