As someone who only dove into PvP more recently due to the Garo, I would like to compare my experiences with Frontlines and Feast. Although not only perfect, Frontlines allowed me to easily pick up ways to strategize by learning from other players-- ones I didn't even directly communicate with. They simply posted self made marcos or took the time to advise the entire alliance on what routes to take, what ice to target; information a newer PvPer wouldn't be privy too. I still have plenty left to grasp to better perform, but I am at least able to reciprocate what I've learned and help other people in the same way. I even took up trying to advise a group, which wouldn't be possible with chat restrictions. That segues rather nicely into The Feast. I am basically helpless. No one can communicate with me nor can we strategize targeting a single "priority threat." How can I learn from silence? Yes, I'll inevitably come across jerks. But let the community report these people and they be removed.
Basically, my overall experiences with Frontlines has made me a better PvPer, whereas the Feast I'm left alone trying to figure things out in a mode I have little experience with.