I just tried to run some Fireteam MM again and it takes about 30 seconds before I'm the only guardian alive and expected to fight off three overloads and a couple of snipers - something that is more or less impossible when you have a weak roaming super that wont stun and an AR. I have no chance of reviving so this goes on for 30 seconds, followed by people reviving and instantly leaving. It's completely pointless to even attempt to play it - meaning that there'll be even less to play. Matchmade portal activities should be at the level of old Vanguard strikes and not old GM's.
This needs to be sorted out tomorrow or at the latest next week. I would argue that there shouldnt be any negative deltas above 500 - as in the enemies capping out at 500. That's when you've reached a level where you should be able to reap the benefits from leveling. It's completely unreasonable that you should have to go in with a team and optimize builds for daily content. It was way better - and had much more autonomy - prior to this delta change.
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So let it die. Given that's what "the majority" want and are predicting as a foregone conclusion anyway, there's no valid reason for Bungie to undo the work they've done recently.