Running is the smart thing to do unless you need to use yourself as a meatsheild in order to protect the flag/sheild/spear/chalice holder , whats the point in fighting a battle your not going to win??, much more useful for you to retreat and try a different tactic to defeat a foe , you just end up racking up points for the enemy team otherwise... i dont get why so many people get upset about it .
not to mention it can also lead the more aggressive player on a team into an ambush where your team can take them out .
I've run too ... if you're going to die without replenishing your health, might as well get moving . I mainly play the 4 vs 4 Favor of the Gods mode & have rushed in to help a team mate fend off the 3 on 1 scenario & the team mate leaves me there to die .... so if I get the chance to flee, I do run .