well... perhaps not the point but i fairly remember that in one map of Halo 3 (the one that looks like a giant bridge??) the RL was placed in the middle of the bridge and at the begining of the game almost everyone made a run for it to get it first, wich almost always ended in me jumping grabing it and sending everyone (own team included) to smitherens while they were fighting, when they changed that in the recent games i hated that map
i´m not a master of rocket launcher, i am fairly sure i have died more times trying to aim that thing than killing people, i am fairly better with the standard weapon (forgot the name, almost all my kills are made by that weapon) but those few secconds at the begining were great to start the match, after a while they stopped going for the rocket and started to go downstairs to get either the shotgun or the sniper, and from then on, everyone scattered and i never again was able to kill anyone with the rocket, i dont think its a bad thing, but it is definitely not over powered as people claim it to be, if you master it you are great, if not, there is a good chance you will get killed (like me in several times)
and the grenade launcher, it gives you what?? two shots??
its no different than the sniper that kills you with two shots (one if its a head shot) and one can easily avoid the grenade if you are far enough, there is one weapon thought that every time my friend selected it, he would kill us all, he was great with that weapon(dont remember the name) its just aim and shoot, if he aims well enough he can kill you in a few secconds, just like the GL...
they are in my opinion neither noobish nor cheap, true, they have a higher rate of success than most weapons but if you are good, you are good, no matter the weapon you are holding.