Ok so in the one crucible match I played before getting booted, I can say this:
1.you can definitely tell that doctrine does less damage, but it and CB are still very good and I feel you will still see a number of doctrines out there.
2. I can't tell the difference with arc blade. At all. And I doubt the nerf to blink will make much of a difference.
3. I got hit by flame shield and the activation delay makes a bigger difference than I thought. I was still able to bring down his health a little bit before the shield came up, so it's really no longer a " I'm about to die, so I should melee someone" kind of perk, but still powerful.