Dead Man's Chest -20%
DH2 -16%
Sub-10% is impressive any time of year for a $100m+ opener
Even Transformers 3 only got -11% with a Wednesday opening and Fourth of July.
If this were a DC movie then I'd be more bullish about the Sunday drop being softer, but it's going to be hard for AoU to match TA1's -18%. Definitely better than IM3's -30% though.
SM2 grossed 92% of SM1
TDKR grossed 84% of TDK
AoU would have to gross $570m match the SM decline and $520m to match the TDK decline.
Minimum 2.7x legs which I don't see happening.