Overall I really liked this adventure, it's unique and attacks you on a completely new axis (attacking your cards). The first run through I used a firestorm team, and for this adventure that seems to be as easy as it will get. On my next attempt I used a 2X warrior and priest build, and it required a lot of customization to succeed. Overall this adventure comes down to dealing with attatchments. So arrogant armor is a must, and having your priest carry appropriate epic items was also needed. 1) Generally I think the first level is the most difficult. The melee monsters have poison and put you on a VP clock. In combination with the psyonic porpoises it required by far the most retries. 2) The second level is cool, hard in a different way. But it really carries through from the first level's lesson, where you have to be able to remove attachments from your own team. Once you have that figured out it was easier than the first level as there is no VP clock. 3) Love the last level for this adventure. The giant brain was very cool. I used elves, and had a ton of movement to get around the map to attack him. One note, this was the only level that didn't require me to restart it.
With your firestorm build? First time, I beat it with firestorm pretty easily as well (though the brain does tend to hold a lot of blocks).
I don't have a firestorm build on the test server I do have a couple copies of the card, but found that it was really bad for my purposes, since it added attachments to my characters for Brain Hook