You're not playing the game wrong--it's just that lots of other players, especially those playing since launch, ARE sick of the grind (which is entirely Bungie's fault in terms of game design and content) required to level up or get new gear, so they find ways to exploit or cheese bosses. Early on (I sold my launch copy after a few months, so maybe it's different), Nightfall runs were virtually impossible without cheese.
I'd be willing to bet that everyone who cheeses or exploits, has at least one character that was earned "legitimately"...and that's enough to realize you don't want to go through the tedium again.
I sympathize with the kid. I had a Level 29 and gear for other classes, but I had no desire to go through the story or grind my way back up just so I could use gear that was received for a class that wasn't mine (lololol) or earn more than X currency per week.