Skolas is a really well made encounter that's mostly ruined by elemental Burns. Makes it too annoying to try and stay alive, so everyone just kills him quickly with burn weapons, which removes virtually all mechanics. I'd be happy to lose the 3x damage boost if it meant I could reasonably stay alive long enough to engage with the encounter, instead of getting insta-wrecked by 3x-damage-buffed enemies.
They really need to get over the idea of "multiplying damage modifiers = challenge." E.g. Lightswitch is so stupid, makes no sense that suddenly a weakling dreg can one shot the entire fire team.