I get off meta, but...

Is it ranked? If so then I agree with the "please don't do this unless you're amazing with it", but that would still scare me regardless. If it's unranked and they are trying out off-meta stuff, then I don't really think it's fair to hold them against the wall. Despite whatever animosity we might hold towards unskilled people, we can't just curb them for trying new things; as long as they're trying.

I had a teemo go AD mid with smite

Who's this 'meta'?

I almost had a ranked game where I would have a vayne support. Before my support picked vayne I picked vayne. Then my support locked Yasuo. I then said screw it and dodged the queue. I regret nothing.

Ok how the heck do you tell if you're amazing at something or not? Yes, you can be good at something but I promise you, you WILL have games you go like 0/4 because the other team is just plain better than you. You're bad compared to them sure, but it worked like every other time and have a positive winrate?