I think it would be good if there was a set amount of exp you get per win.
When I play MM I often get very shorts game in which I‘m not able to get any exp which is kind of annoying. Even though there is survival exp which you get at the end of each game when you‘re in a party and die and spectat the other party members and the game ends you don‘t get that survial exp. Adding a set win exp of 10xp would be enough in my opinion.