Bugs and PR
I'd like to see more transparency with the myriad of bugs in this game. Bugs should be a top, top priority, and players should always know exactly what the bug is. It should never be the case that a champion has to be disabled for an entire LCS split because they are bugged. It should never be the case that players have to dig through the League of Legends subreddit and Sherlock Holmes their way to the exact nature of the bug.
Maybe Riot thinks it would be bad for PR to admit that their game is buggy as all hell, but I think a business model of honesty and transparency would give them more points in the public eye than desperately trying to sweep their bugs under the developmental rug.
No more of this, "Due to a bug, ______ has been disabled." bullshit. Tell us exactly what the bug is, why you think it exists, and how long you think it will take to fix it. Make bugs a top priority, and actively acknowledge player-reported bugs---don't just ignore it and then post about it in the next patch notes and insert a corny joke.