And I find that idiotic. Now, I would say there is concern at DW since their movies haven't been making much money lately, at least domestically (Turbo opened very week over here, but found an audience in Asian and Latin American countries that put it well over the top, making back almost twice the budget). Other than that, this is studio accounting at it's finest. DM2 had the advantage of opening up on a major holiday weekend on a Wednesday with extremely weak competition the entire month long. Considering the last animated film, one that opened in May, mind you was so unappealing that it didn't even have a double digit million opening with literally no other kid friendly film out but the then month old Rio 2. It internationally made around half its budget. How is that weak?Basic math challenges that assumption and sets this sequel on track to make more than the original. Anything could happen. However, because the studio expected higher returns, DW stock dipped today. They expected this to be a sure-fire chart-topper (like Despicable Me 2) instead of just a very solid opening. My ire at this being considered a failure is more about industry perceptions than your particular post. It's not all black and white. Any other animated picture would welcome a healthy opening like Dragon 2. I think the franchise is safe.
Plus, well, let's face it. Not everyone can see every movie on opening day. The long term is important. Certain films can still make money months after. Overreacting to a strong but not strong enough opening seems exactly what stockholders would do (don't get me started on them).