Mi opinion is yes, there should be a display that allowed us to know how much stun we have suffered/inflicted.
it would promote changing tactics (be more agressive if your opponent stun bar is almost filled, or more cautious if you watch your stun bar close to get filled).
what do you think?
EDIT: to avoid confusion about what im talking about, you can watch an example here done by Dysan_ (props to you mate, the pic is awesome!):