While you are correct that information in our articles should be written in third-person, the perks listed on weapon and armor articles are direct quotes from the game, and direct quotes needn't be rewritten.
One would use direct quotes from the game if one wanted to be acurate and informative. While we may not be a game guide, most pages are not for giving our own opinions or paraphrasing. This is a data base for Destiny, after all.
Even if direct quotes from the game is used, it should be referenced so that it's made clear. I couldn't tell the content of the article was a direct quote from the game, so I changed the language to third-person.