You don't gain any XP when you enter a match late. This is why it isn't done in MOBAs. As such, if you get thrust into any match halfway through, you are at an immediate and distinct disadvantage to all other enemy players who have been in from the start and already have 2-3 of their feats unlocked. I don't want to leave games mid way through, but it is also a complete waste of my time not to. This needs to be fixed.