This game is exceedingly boring because the entirety of it is trekking from point-A to point-B in a linear sandbox, and it's obvious.
GTA5, for example, feels big and open. They use as much of the landscape when they're able to and it WORKS! With Destiny it's: Enter room and stuff, enter next room and kill stuff, have Dinklebot open door while you kill stuff, etc.
"Doors are the secret to Destiny, and opening them is what makes this game successful," said every developer at Bungie.