Bots are smarter then players.
I was playing a custom game with 9 bots. I wanted to test out the new items. I was playing yasuo. I noticed some of the things the bots do that I don't see players do enough of even though they should. Sure they suck, but they got brains.
The bots back out when they are about to die or just low on health. Instead of staying with 200-300 Health near a turret and expecting to not get dived on like a lot of the players..
They actually group mid for a push when winning.
One moment the rammus bot on my team was running for his life against 3 bots cuz he was low. As soon as I showed up to help he went back in and knocked all 3 of them up and I got my ult off.
I think everyone should go back to bots and play few games and learn a thing or two.