I'm on the imperial side and we're fortunate to have a reasonable ratio with the republic, we also have a few VERY active republic pvp guilds which is unfortunately causing some problems. Because a lot of players have the mentality that pugs cannot beat a premade if they see an emote from a member of these guilds they just leave the warzone and re queue, unfortunately I can't really blame them at this point. Why bother fighting when you're likely to get rolled over and get zero reward for your efforts, sure you might be able to play an amazing solo performance against them but it doesn't matter. The game will end and you'll get zero to very little for your efforts.
The knock on effect here is less people are joining for PvP, the gear gap between the premades and the pugs is getting more and more obvious which is just exasperating the situation. It's drastically changed how people view pvp on my server, I'm fortunate enough to be in a very good guild that frequently forms groups for pvp but even then trying to get the other 4 players to care can be an uphill battle.