Include Grades in Match History Tab
I'm not sure how hard this would be to implement but I feel like it would be pretty interesting to see how we did grade-wise. Once you leave the end game screen there is no way to see your grade again.
I think it would also help to see if you're doing well with a champ you are practicing in terms of what Riot has determined as doing well for the champion, or to see if you're improving. I'm also sure there's some people out there who would love to do some number crunching to figure out how to consistently get S ranks based on your game stats.