I made a small website where you can enter your summoner name and get stats about your ranked games this season: stupid stats like how many minions you killed in total, but also more useful information like your winrate depending on game length, the champions you're weak against, how good of a laner you are, when you play during the day, etc, etc.
The link is here: http://www.teamward.xyz/achievements/
The stats are built from roughly 200 millions games, tell me what you think about it! I'm interested in ideas of stuff to add, especially for support mains (most of the metrics right now are not super relevant).
If you don't play ranked, or just want to compare yourself with someone, have a look at http://bit.ly/2zSkLUX (that's Faker!)