User blog comment:Diyartifact/Shepard's adversaries/@comment-3228423-20120404115742/@comment-1388547-20120405013359

The Long Walk (how is it long? It's 15 minutes, including the fighting!) was occasionally challenging, but the only really hard part is the bit where you're cornered by Husks with a Scion backing them up near the end. That part is nasty, but you can get through it fairly efficiently by focusing down the Scion with Shep's guns and the entire party's powers, sparing just enough to keep the Husks off you. Once the Scion is gone, the Husks aren't too bad.

For me, at least, nothing in the Collector base compared to the fighting aboard the Collector ship. Part of that is that, on Hardcore or Insanity, the first fight on the Collector ship starts with a Scion and a Harbinger-Collector at close range, then settles into a protracted slugfest that's only slightly less intense as the reinforcements arrive. A number of the subsequent battles on the ship are pretty nasty too, and if things go badly in the first fight on Insanity, I may very well have no medi-gel left and little ammo. There's nothing anywhere near so intense (for me, at least) at the Collector base, and by that point I also have all the upgrades, including some important tech and biotic ones, as well as the last shotgun and sniper damage boosts.