I played LA for about half a year and I liked the way they did their arena modes.
They had 3 arena modes, the most popular one was the one similar to the 3v3 we have now except people could die there (like 5s rez timer) and dying gave other team 1 pt. After a fixed time, which ever team had more pts won. If it was tie, they went into overtime and then sudden death.
2nd mode was basically the ogre colleseum from WoD. Bunch of people joined and it was a FFA, this was the least popular mode.
My favorite mode was the dueling mode. Where we’d have a random team of like 4 or 5 on each side and we’d pick our position in the line and would 1v1 while rest of team spectated. The winner of the round would move on and fight other team’s #2 positioned player and so on until they died. I’ve seen really good PVPers 1v4 before dying, was insane. Very cool mode. This mode would have to be DPS only (good news, every class in the game has at least 1 DPS spec so every class can queue this).
The person who wins the 1v1 would go into 2nd fight with current HP and cooldowns (no resets) so they’d go in with a disadvantage so it’s more fair.