This is the same on The Bastion.
I love doing WZs as a scrapper scoundrel and seeing that we're facing an imp PuG team.
I have spoken at length with my guild about we have surmised that the nature of imperials as "evil" "dark side" "darth vader" appeals to a younger audience who may not have the inclination to learn or may just be too immature to think clearly in the heat of battle, sure they've trained on CoD but that game's all about damage not objectives so that's what they go for; See an enemy running somewhere and take a few mates to whale on him meanwhile the objective is lost. Hence the majority of the ones who are not in premade teams are going to be pretty bad.
Solution: make friends with the good players, make a WZ team, have more fun
I love tranquilizing people guarding on the imp side, they always blow their cc break the first time LMAO, then simply re-tranq and cap the node while they snore.