I feel as if public games ending up uneven or unfair should be considered normal at this point in Hawken. People have been complaining about team balancing issues in Hawken for as long as I can remember playing the game. I'm not about to say that they aren't unfounded or justified complaints, but the dead horse has been beaten so many times it's practically a pulpy mess in the barn by now.
I won't speak for the current developers, but it's more likely than not that they're aware of it. Whether or not a working solution is possible, or if it's a high priority for them, or if they're just plain ignoring everyone is a mystery to me. At the same time, it doesn't matter very much to me.
Seeing as the game as is won't be changing for a while, it might be useful to consider changing your view of public games. I understand most people want to play in a game where both teams are evenly matched in skill and the final score is as close as it gets. Unfortunately, the odds of this happening are against you - even in many games besides Hawken. If a perfect solution exists, it hasn't arrived yet, so you might as well accept it for the time being.
My advice is this: lower your expectations for public games. Don't set your sights on victory and complain when you lose because you've been put on a team of random people you've never played with before. Most of the time it's just out of your control.
I think you have two options. Firstly, you can make the most of it. Personally, when I realize that my game is unbalanced, I put my focus into aiming or positioning myself as well as I can, regardless of which side is getting destroyed. It may not be as satisfying, but by the end of the round I've gained something that will carry on into the next game and onward.
Secondly, you can play Hawken competitively. Yes, this is obviously biased, but the point still stands. While I can't guarantee balance in every game, you can at least be sure that your victory/loss isn't the result of who you were or weren't randomly paired up with. Instead, it depends on you and your team's skill and ability to work together - a team that you spend a whole season with, as well, and not just ten minutes.
One way or another, I think these sorts of threads are more common than is productive. It's understandably frustrating, but instead of sitting around expecting someone else to do something, you should just do what you can yourself.
"How do you avoid these cognitive biases? First, be aware of them. Recognize that we're all susceptible. Second, reconsider your first instinct whenever you've performed poorly. Often, these first thoughts revolve around preserving self-esteem and distancing yourself from responsibility. Always consider poor performances your fault, as that places them within your realm of control." - Nept
The Automatic Mustangs
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