Take a chance, roll the dice!

So much within a virtual world and my stupidity chooses this...
Within most virtual worlds, the player must obtain any and everything they get through hard work or luck(unless you are a Chinese gold farmer or have an elite friend, then you get booted up to everything with the status of a noob still.) But this is aside from all the stupid loopholes that would give a noob a helping hand past everything and still be stupid( like I explained last sentence). But when a player grinds out enough rat skulls or whatever stupid errand they go on, normally a good item, or something that can give enough money to make ends meet.
Enough with beating a bush, when the player works their butt off, and is given an item that they could have used when they started off is now worthless when obtained. Why, you ask? Simple, most likely the Random number generator(RNG) gods were kind(/asses?) and gave the player a weapon that shames whatever would have been the goal, making the quest useless other than some cash for the "good" item. This is only an example of how random events can ruin a game, and such a minor way. What if the quest was a mid level quest that gave items anyone would go for, then (only one example:WoW) an epic weapon drops off of the 3rd to last up to last guy, and after the player stopped spazzing out about what they got, equipped it and ravaged the last few guys, got the item and lived happily ever after. That weapon would last a very long time and make quests that reward with other weapons pointless, and make everything in the area fall like a fat kid with his shoes tied together. Even since I used World of Warcraft for an example, that does not mean other MMOs don't do it.
In fact, some games survive off of the RNG system, most common RPGs. Fire emblem( for those who know it) is just an interactive RNG with pretty pictures( for lack of a better similar/metaphor). Everything is determined by an unseen code picking a number at random and if the right one is picked, it's pretty much the lottery.
So, Given it's in almost every game and seems to make some games, is the RNG system really good for the games it's in? Are random godly weapons awesome to get at no specific time(of course!), if it were to "ruin" the experience of playing the game when it turns into click and kill? Some games (Fire emblem, Final Fantasy tactics) are based solely on the RNG and therefore make a good game (when the generator stops using the player's men for chew toys). I, personally, would think it should be removed from some games for how stupid lucky people can get (and that I'm as lucky as a Black cat living under a ladder with shattered mirriors everywhere) and that some things shuldn't be controlled by Random elements.