Heroes Ascent
First of all, I believe that GvG concept is pretty covered in GW2 by WvW and this is a solid reason to not implement that type of PvP.
This just turned my stomach. If people who have never played GW1 GvG could stop saying things like this we would all appreciate it a lot, thanks ^^
Single match conquest is best game mode for e-sports, why would you ever want anything else?