Yeah, did seem like this quest is a lesson in using interrupts which you start getting around that level.
The riflemen seemed harder then the actual general boss.
Agree regarding the rifleman... they just would not die.
I did this one last night for the first time with 3 strangers, one healing and we knocked it out first try. Some of us were killed a couple times but we made it through killing everything in the way and not skipping anything.
Had a good time, cool little cutscene of the 4 of us walking away from the location with the explosion in the background. I specifically remember one person in my party saying how difficult the baddies were and I responded at least they aren't pushovers.
Id rather them be tough then just walk right through them.
This mission was a good time IMO.