Sated devourer is not OP at all..
The 2 champions i see people complaining the most about are Shyvana and Master Yi, saying they do too much dmg or some shit. To start off, both of them need to farm 2.2k gold to get started on their devourer... and they are both still shit at ganking early game with their 0 CC, which means that the only way they could've gotten the gold is through farming which is slow and tedious. If they somehow managed to kill you early you're just bad, and didn't lose cause of sated devourer (they don't even have regular devourer yet tf). By the time they have enough could for devourer, they could only get stacks on it by getting easy assists/kills on you (which still isn't because of sated devourer) and clearing camps (and don't say dragon because it's your own fucking fault for not warding dragon). SO yeah, unless the shyvana/master yi was 0/0/0 until they got their sated devourer 30 minutes in, you can't complain because your team either fed the shit out of them or have 0 dragon pressure, which would make you guys lose anyway even without sated devourer. Devourer is basically like a mejais/sworf of occult.. If they rush that shit and u still die to them before they got any stacks, then you deserve to lose and will lose because they will only snowball harder.
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is gonna be doing about 70 true damage a hit with 16%-24% current health +200 magic damage. Try dueling that for 4 seconds (unslowable too not like it matters with that much as)