The Rocket Launcher is a weapon from GTA I, GTA II, GTA III, GTA Vice City, GTA San Andreas, GTA Liberty City Stories, GTA Vice City Stories, and GTA IV.
It is an extremely powerful weapon, capable of destroying almost everything. But for shoot-outs it's inadvisable because you have to shoot through the aiming mode which is very slow. The advantages of this weapon are its power and range, with its blast being capable of inflicting heavy damage from several meters away. The disadvantages are slow aiming and the propensity to seriously damage one's own health by accidentally hitting a nearby object.