To be technical, they didn't forget rpg. Rpg stands for role play game. You can do that anywhere at any time, even in destiny, or without it... But yeah, lol Basically they tried to put in rpg and mmo mechanics into an fps that has the typical fps content length of 6-8 hours... And then forgot to include a story that can be understood so we can have a reason to actually care about what we're doing. Seriously, I still have no idea what's going on in that game story wise. All I know is that we helped Rasputin I think? Somehow? But now he's in our way or something for a reason that isn't stated at all? Why are vex as bad as the stranger made them out to be? And the fact that we got a gate lord'a head because apparently only they can get into the black garden? What the hell IS the black garden? Why are the vex in stasis? How did the hive get a piece of the traveller what were they doing to it? Etc... Basically I have no idea what the hell was going on. And then there's further weirdness on why the factions have most of the good gear when guardians are fighting for human survival and how the gear can only be obtainable by having guardians fight each other rather than the darkness? Among other things like previously mentioned where dead orbit seem to have no interest in ships you find while the shipwright has no desire to take any ships you don't want?