A major factor in BF2 was the ability to bunny hop and Dolphin dive.

People may give out and call you names but these simple tricks will soon have you reeling in the kills.

Bunny Hoping: simply when someone is shooting at you jump into the air in an attempt to make as hard a target to hit as possible.

Dolphin Diving much the same tactic except, after you jump into the air, you lie down(while still in the air) and begin firing at the enemy.In the case of Bf2 as soon as you are close enought to the ground your gun will begin to fire.