I ran this with a lvl 19 rad/dark tanker at +0/x1. I had no trouble with the difficulty. I played it without solo bosses.
I liked the arc. The missions were uneven with a variety of villain groups, so each felt fairly different. Each felt like its own story and not just another excuse to beat up enemies.
A lot of text in the opening mission intro, but it spelled out clearly what was going on. And then the amount text varied, so it felt right.
The 3rd mission was great, very different feel to it.
I would have liked more details in some of the missions. There were a lot of standard spawns of foes to grind through. A few bosses that talked or other things to break it up would have been nice.
I would have also liked more variety of villains in the missions. Through in some regular paragon police, or mooks, or whatever. While between missions there was diversity, within a mission it tended to just be the same fight over and over again.