WHAT YOU NEED TO KNOW: With the success of the ICONS Hero Pack, it is no real surprise at a Hero Pack 2 came along. All of the art is still provided by Dan Houser, with characters created by ICONS fans, but this one only had 30 slots...which means the PDF is 65 pages, with every character getting a full character sheet and a background "page". Each character also receives a printable standee, so if you like your standees, there's a whole slew of them available for you here.
WHAT WORKS: One of the gripes I had about the first Hero Pack was that many of the characters weren't usable "out of the box", due to Qualities and Challenges not being specified, as well as the characters not having backgrounds...that is a non-issue here. Many of the characters were created by the same people, and have their backstories interwoven with one another. If I had to pick a favorite from this set, it would be Mook, a common thug with Duplication powers who hires himself out as an all-purpose Henchman force.
WHAT DOESN'T WORK: Some of the images, names and concepts seem to be an odd fit (Shadowform, the shapeshifter who turns into various tools and wears a green costume comes to mind).
CONCLUSION: From a design standpoint, this is an improvement over Hero Pack 1 in just about every way. The trimming down to 30 characters allows all of the characters room to "breathe", and allowing the artist's work to show off more than the otherwise crowded Hero Pack 1 did, and at $2 less than the first one.
[4 of 5 Stars!]