Ok, it is my personal opinion that the Skolas fight is extremely cheap. However, I think the one thing that absolutely needs to be changed is a last remaining Guardian getting poison.
If you want to give us the stupid mines and the poison and the ads and Skolas all trying to kill us at the same time that's fine but pause the damn poison if there's only one Guardian alive. Or at least increase the time it takes to kill a guardian if they are the only one alive and trying to res teammates.
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It's not a bad fight now difficulty wise. They do need to patch the glitch that poisons two allies at once though. Bungie really needs to test better.