I don't mind grind, when every time you play, you get closer to your goal, by accumulating currency, or levelling up towards what you want. But Destiny grind isn't actually grind at all, it is completing chores for the chance of gaining the gear you are after. You complete a raid or nightfall for the roll of a dice. Meaning you can win the Raid, but lose on the RNG. Or kill Crota, and get another pair of feckin boots, when you just need the helmet to finish the armour set. The reason why this isn't grind, is because you are up against fixed odds, which means you are no more likely to get what you need on your 110th attempt as you were on your 10th. (see Gamblers Fallacy)