You can use Lightning Reflexes to simulate an evasive shot, and you get some great options for keeping people/things at a distance when you’re using the longbow.
I use longbow/greatsword in PvP and it’s great. I extended the range of the longbow through traits and have my signets recharge as fast as possible, then I trait/gear for crits. Usually I can crush someone before they get close to me and if things get tight I have a greatsword also spec’d for crits that I can use up close, then it just comes down to skill.