As much as Riot supports offmeta, please don't do it in Ranked
It's not your fault that offmeta is disliked. It's the game's design.
If you don't play meta, you're usually fucked since this game is mostly decided in champ select unless you're in low elo. And by meta, play champions in their usual lanes.
Even if Riot says offmeta is supported, it isn't because the game supports the meta so heavily that you have a higher probability of losing if you go off meta. Offmeta is fine in norms and Bronze though.