I just had a wild thought and I think it is a good one.
Imagine after playing 200 games, some good some bad. You have played all the heroes but you're not 100% sure of which ones you are overall good with,
how about, for example on the character selection screen, next to the hero you might choose your personal history is in the "mouse over tool-tip"
you might wanna choose devourer and you see, by choosing him you have 120 kills and 70 kills, and a win% of matches. It would be a nice little addition i think.