If you want to PvP and don't want to play the same Warzone repeatedly
and have no queue times you will not play Empire. Unfortunately this is a problem that exists on almost every server and particularly on PvP servers the Empire is far more popular. This of course means that there aren't enough Republics to go around for all the Warzones that the Empire queue for.
I myself have a level 50 Imperial Agent Sniper and I'm sick of playing Hutt-ball over and over. I'm now playing a few classes on Republic and I rarely ever see Hutt-ball.