1-3 are all pretty frustrating and have wiped me many times. Combined with the heavy ammo glitch, damn that hurts.
Knights walking through the shield happens though rarely and honestly it is pretty easy to avoid them if your paying attention. Which most players aren't but still. Crota hitting invisible hunter is lag issue and I don't consider it a real bug.
The sword bearer issues you bring up aren't bugs at all and actually can tell you how good your party is.
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The sword bearer issue, is an issue, an AI that 90% of the time will stay in the center, and then randomly completely disregards stagger shots and just runs completely straight to the ogre room. This is a glitch in the AI mate, we could do the same thing every single time and he'd still get that one time that he just decides to ignore everything.