Apologies if this has been mentioned before but I must say even with my limited PvP experience this is the main annoyance that the game now gives me .
A suggestion with the introduction of the Baltazhar faction would be to punish people with a points deduction when they quit out prematurley because 1) they die early in a battle and cba waiting for a team mate to rez 2) they just quit if they see their team looking like its gonna lose or 3) they just quit before the PvP battle has ended because they are build testing etc. Oh or 4) they quit because they are just plain muppets.
You know when its blatant because most people who do it obviously ensure they are showing as offline for 'whisper' purposes.
Something needs to be done to preserve the game's enjoyment for the vast majority.
I

). Just don't take the fights there seriously, with random matching, there's no accountability. Use the random arena as a test arena or a place to kick back and screw around with some crazy build you made that you doubt anyone would want on their pickup in droks.
Personally, I think if you're looking for serious PvP go GvG, at least then you can blame your guildies for the mistakes they made 