All Communities get butthurt when a teammate leaves. It brings down the team. Go ahead and ask anyone. It’s just more obvious because when you leave in Battleborn, the game doesn’t replace you. So now you’ve left 4 other players high and dry, giving the opposing team the advantage.
Also, if you’re new at the game, that doesn’t make it unbalanced, it just makes you terrible. It’s not your fault, you’re new. The matchmaking sucks but level doesn’t signify any level of skill. You can play the story mode all the way to level 100 but that doesn’t mean you understand an ounce of how the multiplayer works.
That being said, you seem like you’d be more comfortable playing Call of Duty because you can just slam your forehead on the controller and be good at it. Glad you’re not planning on sticking around. Battleborn isn’t for you.