Sim online works out like that because there's usually no teamwork, no objective except to destroy planes, and with the scoring system, no incentive to disengage from a bad situation. Join the team ladder where it's battle for least deaths again.
During the Battle for Europe many of the air combat matches were high speed and at decent altitude, and well-coordinated.
to encourage people to use real-life tactics, here's a link to one of the definitive air combat guides:
http://www.filestube.com/f263ec98406...neuvering.html
Here's an animated demo I made of "loose deuce" attacks. Team USSR used this fairly effectively in Battle for Europe. Say the big planes are Spitfires, and the little ones are 109k4's. The k4's approach in a slightly staggered bracket. The Spits slow down by turning to engage. The lead k4 attacks the spit that passed its wingman, doesn't have to turn more than 90 degrees or slow down much either.
Now supposing it's not flat, that the Spits make vertical zoom turns after they pass? That makes it even more effective as the spits lose speed by gaining altitude and are easier to hit.