Game Update 4 brings the Diminishing Returns formula on combat mods. The original post I made can be found here - The Diminishing Return Formula - Combat Mods.
I figured I would bring one of the most discussed combat roll of BLOCK and how much the Diminishing Return formula will impact it.
The Diminishing Return starts with the first "Block Chance" mod that is added to your toon. The "Combat Defense: Block" reflects the Diminishing Return already, so that % is what you get. Anything that increases the "Block Chance" mod is hit with the DRF. Here is the average "Block Chance" value that players will have:
- Exotic Mod - 8
- PowerUp - 26
All Buffs (including the Medic Buff) grants a straight % increase that does not hit the DRF.
The total amount of "Block Chance" that a player will expect to see is 102. Here are a few images to hopefully make it clearer.


This basically shows that a typical stacker will have 3.46% less "Combat Defense: Block Chance". The Medic Buff was cut in half to a 10% instead of 20%, so overall, there will be a 13.46% less "Combat Defense: Block" than people can stack on live.
It is indeed a reduction so it the general term of what a nerf is then you could call this a nerf, but the reduction still keeps the mods worth stacking and will still be a powerful bonus.