At 750,000 credits, it is the most expensive pack in the store, tied with the Arkham Pack and the Wonder Woman 75th Anniversary Pack. It is also barely cost effective, while most other packs are vastly cheaper than the characters they offer. However, the value of this pack lies in the difficulty of unlocking Harley Quinn/Arkham from the console game, as well obtaining Deathstroke/Arkham Origins if they missed his challenge, or having to waste a large amount of credits on Challenge Booster Packs otherwise. It is also possible that this pack has been replaced by the Arkham Pack permanently, as this pack hasn't been sold again in the store after the Arkham Pack has been added in the game.
While the Arkham Asylum Pack team is indeed very strong, note that it almost twice as expensive as the Red Son Pack, which is also much less complicated for new players to get used to; for players on a budget, the Red Son Pack can be upgraded to much higher stats for the same price.