When did Rammus become so OP?

I know this is a weird thread to see... but seriously just had a game against him and he was 100% unkillable most of the game, he just bought a bramble vest early on and from 6 onward could 3v1 everybody. If you don't have AP is he just an unkillable god? as if so it seems like he's a god pick for lower elos where having a good team comp is luck of the draw.
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