IIRC the old hatred for survs from xenos and devs boiling down to: “break the game loop" 
. And the nerfs show this: try to reduce survs into food fodders for xenos who refuse to be a drone and build a proper defense against marines. But problems rose from survs: given enough time and experience even the preys can be the hunters.
So either leave survs alone and tell xenos who died to them “skill issue" and cope with it, or remove them outright.
Nah man, you got to understand that it goes both ways and is just another stage of the round. Its literally just a handful of guys barking at each other nonstop about survivor xenos. Its the xenos who regularly die to survivors every round who have the biggest opinions cause some people cant stand losing and have been validated by other said players, and survivors who develop a hatred for xeno players facing things completely out of their control. Talking about neurospit, 2 tap, and drone spam here.
Survivor’s part of the round and part of the game loop, some people cant stand when they dont win. Thats all there is to it and its so stupid.
Ik man,
When I play xeno I ignore survs as I know my skill parring survs, and most times I would die to pb. But you can’t deny that players from both sides with the protag syndrome: “they are just a skill check, how dare they kill me” leading to buffs and nerfs suiting whichever side said buffs and nerfs owners belong to.
Just for fun, I plugged the two weapons into my excel spreadsheet.
Here’s what I got:
This is assuming 5 tiles range, full auto (because burstfire on MAR is a trap) and 100% accuracy btw, so since the MAR30/40 have worse ACC the actual power relative to a Mk2 is significantly worse than shown.
Generally speaking, if a gun is better than another gun, it’s just a fact that it’s more difficult to kill stuff with the shittier gun. You won’t be fragging as hard with a MAR-30/40 than you would with a Mk2/MAR-50, assuming everything else is equal.
So yeah, that tracks with what most people have said.
EDIT:
@RainbowStalin (55 * 200 ) / 60 = 184, I don’t know how you’re getting 275.
I also lumped the MARs together which was a mistake on my part, the MAR-50 does have much better accuracy (as I’ve lumped it with the Mk2 in the later comparison of good vs worse guns), so that’s my bad. I’ve corrected that section.
Where are you getting the DPS of the MAR-50 from? Because by just doing very basic maths ((Damage*RPM)/60), the DPS is 275, and not 184 which is in your sheet. Also, the MAR-50 isn’t as “inaccurate” as you present it as (20,8 accuracy of the Mk2, vs 18.4 of the MAR-50 (also has less scatter than the mk2)). Scatter is imo the worst part of most “inaccurate” guns.
Edit:
Haha. Roast the noob.
But you can’t deny that players from both sides with the protag syndrome: “they are just a skill check, how dare they kill me”
I wholeheartedly agree bro 
Sometimes you get two-tapped by a young XX drone and sometimes you get gangstalked by two guys with shotguns that want to put you in an epic frag montage that they omit their deaths from (occured 30 seconds later) It’s just how the cookie-crumbles
