Nothing wrong with the 109s in the game, other than the cockpit bars. I've got beams in my walls that aren't that thick.
I'd rate the K-4 in the top 5 fighters easily, probably top 3.
The 190s on the other hand, just aren't good fighters. They never have been. They weren't in real life. In real life, the 190s were generally marginally faster than their opponents, at low altitude. They were never more manueverable (unless one counts a half roll and screaming dive towards the ground as a 'manuever') In real life, kills were nearly always made on unsuspecting targets. That isn't to say they the guy who got shot down wasn't engaged, he may have been fixated on his "target" and never saw the guy who blindsided him, but I guarantee you that combat in real life was not 1v1, 2v1, or Xv1. It was between two groups of planes, and it would probably make even the most timid pilots in the MA look like they were suicidally agressive.