Forget noise abatement, fuel conservation, formation landing etc.
I was taught that a run and break into the circuit is tactically the safest way to join. The airfield and immediate surrounds are the only area that you can be reasonably sure is clear of manpads (man portable air defence systems) and therefore the safest area to decelerate into and then further restrict your manoeuvrability with flap and gear.
Oh yes, and it was bloody good fun......
