[quote]you would be throwing away your guns [...] when the next game came out[/quote]
Newsflash; this isn't the "next game;" it's a [i]DLC[/i]. It's a totally invalid analogy, man, sorry. :P
And while the game may be RNG, many weapons still require substantial effort for players to even have the [i]chance[/i] to unlock them, whereas CoD will grant every weapon simply over time.
You have to beat the Raids, you have to beat PoE, you have to perform well in IB, you have to rank up Faction Rep., and you [i]absolutely[/i] have to EARN (not via RNG) Trials of Orisris gear.
RNG or not, gear in Destiny is still very much "earned."
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But not necessarily through long grinding. Some people get a lot of shit with very little effort. If you are grinding this game currently for 1 piece of gear you are doing it wrong.