I have a little question for you. With which champion you have highest Win - Lose ratio in ranked, and with which you have lowest? Plus what's your ELO? Of course I'm not talking about these champion you've played once or twice and won (so you have 100% ratio). Count champions you've played at least 5+ games with (depending on how much games you have overall of course)
At around 1500 ELO, my highest win-lose ratio is Sona. 8 wins, 0 loses, that makes it 100% ratio. And the best part, I'm playing her AP (+CDR ofc). Her heal is not bad in AP build (300 / 4 seconds), she has nice dmg, and if you manage to get to the lategame, build Lich Bane and enjoy your 1k normal hits with passive (if the last spell casted was Q, her passive deals +352 dmg at lvl 18). And, who doesn't like AoE stun? (paired with other AoE CC like Amumu or Malphite you can easily win teamfight)
My worst W-L ratio is with Garen. 2 wins, 4 loses, that makes 33.3% ratio. Even tho I have good stats by myself and I'm doing rather fine, he's not that good. Why? He's not contributing much to the team. His presence in teamfight is low, only good thing about him is rather long silence, but it's melee skill, so it's still hard to interrupt let's say Nunu's ulti if he's away from you. Your ulti is good for finishing, but you're taking kills from real carries, who need them more than you.
So, how about you?