It's just taking advantage of something that Bungie did wrong. I get what you mean because it's cheap, but it's similar to saying Cheesing in PvP should be bankable. Plus the glitch only really works effectively if you get the killing blow with one of the first grenades to hit your enemy.
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I've only used it in PvE and all you have to hit is a wall with the grenade and you get your super
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I'm so glad that you don't know how to use the glitch properly. I tested this, and I had my super within the first 10 seconds if each round. I didn't hit anyone at all with my grenades. As a side note, I didn't use my super against the enemy team during my testing.