Not really but counting kills is rather silly as that completely ignores how much damage the unit actually did, only giving the point to the last unit that shot and not even caring about what was destroyed. Spring's experience system is better but it needs to be mod-adjustable.
also the vertical white bar, placed near the healthbar of the unit (in the 3d view). of course it's only visible after he actually got some exp. which is a rare case since people tend to send their units to death.