It's time to fix this once and for all. Two stuns should completely fill up the resolve bar and make you immune to future stuns until the resolve bar is no longer full.
The other day I was PvP'ing and in a matter of mere seconds (less then 30) I was stunned 3 times. It went something like this. Stun, wait for it to wear off, attack for 0.5 seconds, stunned, wait for it to wear off, attack for 0.5 seconds, stun again, attack for 0.5 seconds and die. Keep in mind the only reason I lived long enough to make it to the third stun was because I was getting healed.