Since the allocation of XP is rather poorly handled at the moment, it's really all about the wins if you want to get decent chunk of it. Though I've seen many people trying to remedy this by afking and idleing their way through matches just to get that tiny little bit of XP that everyone else is rewarded with just for playing, but without actually playing at all. That way they can be doing other stuff outside of the game I suppose. Whilst I don't condone this personally, it is something I've seen quite a lot of players taking advantage of.