I was the one who played the first arc. It was pretty well written, although it's hard to tell what the contact was saying. Also, the arc didn't run with the concept of a hero who is also the spokesman for a gum company. She could, say, capture a bank robber and shout her catchphrase 'Hope the charges STICK this time!"
Ominous Horizons starts out the same way, although Double Mint is wearing a different costume. The Circle is up to something, so we go into the Shadow Shard and talk to Dr. Huxley. who tells us that she has discovered a new variety of Kora Fruit which is orange.
Upon seeing the fruit, Double Mint forgets all about the Circle and begins planning a new flavor of gum, Orange Kora Blast, and assigns the player to go around Paragon City putting up billboards for it. At least I assume that's what she does, because I couldn't get to the final missions. The third mission sends the player to the Nemesis Shadow Shard map and tasks them with destroying a sensor, but I couldn't find it anywhere, and gave up after 15 minutes of scouring the map. I found the cave and rescued a nameless mystic, but no glowie. Please, people, don't use any of the Shadow Shard maps in AE, they're all poorly designed and hard to navigate.
Anyway, Ominous Horizons probably concludes with the player battling a hundred foot tall Incarnate powered Gum Golem in the middle of Steel Canyon while a fleet of Rikti dropships fly overhead and Ride of the Valkyries plays, so I'll give it five stars for having such a badass ending.