Obviously this guy hasn't played the game for more than 2 minutes. The only time I get into a head-on pass with a ship is when I first encounter them. After that it's a game of cat-and-mouse, with both fighters trying to become the cat.
Dunno why you think it's obvious that the guy hasn't played it for more than 2 minutes. I could say the same about you, but seeing as I don't have any hard evidence to support the statement, then I wont.
My experience of dogfighting in Freelancer is that you do a head-on pass (as does the other ship), you kill engine, turn around, hit the thruster and do another head-on pass (as does the other ship), and then continue to repeat the above until one of you dies.
In Freelancer, it's just a series of head-on passes as I described in the previous paragraph, this I believe is due to the limitations of using mouse control instead of a Joystick.
If you had ever played Starlancer or any other similar combat space sim or even flight sim, then you would get on the enemies tail (enemies 6 o'clock) and you would stay there shooting while the enemy tried to shake you and escape with his best moves. I guess you need a Joystick to do this.
Perhaps I'm not understanding your post correctly, if so, could you please elaborate and explain to how you actually fight, when in a dogfight in Freelancer, by that I mean can you stick like glue to an enemies tail whilst using a mouse, or is it just series of head-on passes?