Recently I have been playing a lot of For Honor and the game showcases how awesome 2v2's would be on a game that includes build and skill diversity with ESO's robust combat engine. Brawls would be an excellent addition to battlegrounds because it gives players the unique opportunity to be able to face two other players, understand why you won or lost, and walk away with either a sense of what you need to improve on, or a sense of achievement. To be able to fight with a friend against two opponents and have the match actually come down to skill, rather than the inevitable feel of playing in cyrodiil, where it is just a matter of time before the enemy faction sends enough players.
The reason 2v2s would be so much fun augmenting 4v4v4s is because in a 2v2 arena, there are only two enemies hitting you (pretty self explanatory) rather than a potential 8. Meaning a lot more build and class diversity will be available for groups that want to be competitive, because there isn't as much damage mitigation, or sustain required.
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Magicka Sorc- 'Cadderly