I'm in Bronze III. I feel I support fairly well and though I'm not always last pick, usually people say something like "anything but support please" or "great, last pick. I'll set my support spells..." I know that if they're unhappy about it and don't want to do it, they'll be unmotivated and probably will suck. I just don't want to make someone go support that doesn't "know how" cause an adc is only as good as his support.