u/KriegerHLS

For anyone starting on HC for the new expansion, make sure to note the following two lines from the patch notes:

• Increased all Boss Health scaling with level, by ~32% at level 100 (~15% for superbosses). Some bosses with lower health pools received larger increases. These changes do not apply to the Crucible.
• Many older boss encounters have received tuning passes to bring their damage up to modern standards, as was commonly done in past updates.

Essentially all purple mobs received buffs and those buffs, especially in the early part of the game (I'm currently in the 50s about to tackle the end of the Necropolis) range significantly in how dramatic they are. Things definitely take longer to kill but, more importantly, there are some significant damage increases. Berserker has a lot of great survivability but don't forget to tend to your resistances and armor -- there is some sneaky dangerous stuff out there now.