I liked Doom Bots and all but...
I would kind of like a more difficult version of bots. They have introductory(I can't remember the name xD), beginner, and intermediate, but they don't have a version of bots that mimics how an actual game is played, and I feel like that makes it more difficult for people to learn to play PvP. They go from fighting two tanks in top lane, to fighting a jayce in top, sejuani in jung, and zed in mid(Bot stays relatively the same.). They now have to worry about junglers, and different kinds of characters in different places.
Honestly, that was the biggest thing that deterred me from PvP for so long. I didn't know how actual PvP was played. Whenever I first started playing PvP, I was constantly getting flamed and harassed because I had no clue what I was doing, despite playing the game for such a long time already. I just feel like this should be something that is implemented, because it would help open up the league community and game to new comers; as it has been very closed off IMO for a long time.