I really dislike when people say this. It's not fun throwing games, and I have also yet to play ranked. I don't see myself doing so anytime soon either. Please be respectful of others, and don't have fun at your team's expense. This isn't a game for selfish people.
Why not do AI matches if you're going to be lazy or sloppy? So many people like to play when they're high or drunk too, and that's always depressing. This is a team game, so your actions effect everyone you're playing with. If you're making the game harder for others because you think that's fun, then I don't think you're a fun person. I think you're inconsiderate.
I also understand working off meta, and that can be great, but so few people know what that actually means. If Leblanc is jungling then that is pushing it. Putting your team at a disadvantage isn't cool.