I wasn't aware of this, but apparently, in the game's "Find Co-Op Bot Match" feature, which assigns you a random team of human ally players, then pits you against a team of bots (I guess LoL has this as well), there are 5 difficulty settings to choose from.
This is a pretty neat feature that gives you a lot more room for different player skill-levels than the other ARTS games I've seen.
Also, if there are people in your party before you queue, it will put them on your team first, then fill in any empty slots with random players.
edit: After playing a game against unfair bots, I can safely say you will have a challenge ;p