@Redwyn: You should play normal games, anyways. It's a lot harder to improve if you're only playing custom games; they should be reserved mainly for just playing a champion for the first time or testing out a jungle path. Plus normal games will never set you up with an uneven team to begin with.
And having less bots or more bots on the other team is still an advantage for you. Either you're able to farm freely or you're able to get massive amounts of kills and speed up the game. If it's with players, you probably won't win a 4v5, but even if you do, you should still realize it's not just you playing but the other team had an immense advantage to begin with which should be discouraged in the first place.
@NAMKCOR: k then. Ashe is a part of that majority, though. But feel free to do w/e while you still don't have all your runes and stuff