Quoting Fred_Bonaparte, reply 1i think that it is the purpose of the experience stat^^. It would be interesting to use it to give exp levels to players and be able to see them in the lobbies.
It's strange to me how you gain/loose exp in bot slaughter/2v1s if that's supposed to be an accurate measure of skill
yep, they really have to improve that, having bots in multiplayers to reduce rage quitters problems seemed like a good idea, but it raises a lot of problems like this one... I think you can't lose xp either, so it is more here to measure your playtime but since skill comes from play, i can live with it.