3. Satchel charges can be dodged. I actually prefer the left-right strafe than the run around the kolto tank. It's not that hard to avoid every satchel charge this way.
This. We did a three DPS run last week to speed it up, and I ended up tanking on my sentinel. I've never done it before, but I didn't pick up a single charge. It's not rocket science.
Of course, if you're a keyboard turning clicker you're screwed.