I disagree. It can actually be a good strategy. It's much easier to win playing as a champion whose kit you're only generally familiar with than win playing against a champion whose kit you aren't familiar with at all.
It's not fair for the team that gets the guy who doesn't know what he's doing with a new character. There's zero "strategy" involved in someone going into ranked with a champion they don't know how to use because it was just released, much less a champion that's kit revolves around coordination which is something most teams in solo queue lack.