I love and fear asymmetric PvP. It is so hard to balance well and so good when it is done right.
There is something satisfying about being the big monster fighting several of your friends, or being that group of friends taking down a big monster we know to have a capable pilot. About pitting goblins against elves against dragons. About ninja and samurai, pirates and ninja, merchants and pirates. Symmetry is elegant and much easier to balance, but teams with different advantages and disadvantages add so much more color.
But it is so easy to get wrong, and if you mess it up, it may not be fixable. Or maybe the balance really is perfect, but not in your local gaming group, where one person is especially good with one strategy and makes all the other factions look like trash. It is hard to tell whether the im/balance is in your game or your gamers, and imbalanced gamers can lead to runaway differences in-game.
I see the latest thing on Kickstarter or Steam, and my interest is piqued, but it will take many hours of (hopefully someone else’s) play to see whether the game has the chops to make it work. A bit of randomness in the game can hide imbalances for a long time, and really for as many times as I am likely to play a game, “close enough” is probably good enough.