Are they on crack or something?
1) you have enemies who constantly run away and hide from you
2) you have to look for the objectives and shoot them
3) you have drills and champions
4) on top you have the most disgusting sponge enemy of all time (tormenter) which took hilarious long to kill and any slow super is useless because he interrups you anyways.
All within this time limit???????
Who the -blam!- did this balancing?
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Issue with salt mines is the fact it takes so long for enemies to spawn in. Clear the room and then sit there waiting for the next wave. Spend more time sitting around waiting then you do actually doing something.