I'm having a number of problems with Riot that are getting more annoying because of all these graphical changes. There are tons of new skins and recently a major graphical change was announced while even some basic problems are still not solved!
1. The server is busy most of the time so I can't even play, has gotten worse
Solution: stop trying to get more users with useless stuff like graphics and focus on serving the existing user base first.
2. There is no real replay function. The only poor option is livestream, but it won't make you happy when you dual screen opponents tune in to it.
Solution: Like any decent multiplayer game you should be able to save and replay games entirely (Blizzard). This will allow you to look at event that happened of-screen and look back at those important events you missed and think of better future strategies.
3. The homepage always shows this stupid intro-movie, as I'm already playing this game it's really annoying having to waste my time with it. Also when you're not logged in you keep getting send back to it! Very unclear and kind of pushes people away.
Solution: Tell people to login when they want to make a post while not logged in.