In general;
Aggressiveness - Increase enemy aggressiveness. Especially in mobs. Currently you can ignore some enemies in a mob. Usually we have to contend with the more aggressive ones. You can also change how quickly they notice you and start firing. Sometimes when you walk up to a mob you can quietly get yourself positioned before they react.
Hit Harder - I’ve made this suggestion elsewhere. It can be problematic if enemies are too powerful. My response is “it’s all about balance”. We don’t have good balance now, and we have to contend with Mayhem magic tricks. I’ll take my chances with enemies that hit harder. It will just make you more careful when jumping into a mob.
Resistance to Elements - Yes it’s being done now. Just remove the visuals. We can figure it out when we see the big Resist label.
Enemies Have Higher Chance of Elements - Doesn’t provide raw power, but they have a higher success percentage when applying effects, and those effects are stronger. We would freeze more often, get irradiated more often etc…
Disable Guardian Ranks - All or some. Self explanatory.
Disable Class of Weapons - Self explanatory.
Disable Manufacturers - Self explanatory.
Amount of Enemies That Spawn - Self explanatory.
My biggest problem with many of the current modifiers is they make my eyes barf. GBX creates these wonderful worlds (their level design is second to none) and they turn them into garish visual nightmares. Spinners, attached beams, elemental ovals surrounding enemies. It detracts greatly from the experience. I also noticed these visual modifiers don’t seem to be too effective often. I can almost ignore the spinners. I only kill them for Drowning In Brass stacking.
The non visual modifiers are fine. I think this is the direction they need to go.