I saw a guy go:
"First time veigar"
10 seconds before the game would've started in lobby. Couldn't queue dodge anymore, and neither did anyone else. Thought he was joking, but he actually fed like crazy, and we lost.
I don't think it would be too difficult to create some program that would not let someone play a champ in ranked unless he has done at least a few bot games AND THEN a few normal games with the champ so he would know it at least at some basic level, before diving into ranked?