My favorite pvp is wolf's den /feast (unranked) and I haven't done it in months because it just never pops anymore. I have tried various times of the day and waited 2+ hours on several occasions before giving up.

Frontlines also has a long queue, though nowhere near as long as Wolf's Den. I guess it's alright, depends which one I get, people are generally nice enough. Balancing the teams always sucks though. Sometimes one team has way more healers than another team, so they always last longer no matter what.