It's a sequel to the return to one of the biggest franchises of all time. If there's any examples besides TLJ and FK that didn't drop this much, I'd be genuinely interested to hear about it.
That being said, the current results does suggest that mixed reception is a potential contributing factor in the decline.
Based on its UK opening day (86% of JW in pounds and lower in USD, if I read the thread right), DOM would have an OW of $178 million. I think that's the high end for this.
TA, JW, and TFA all did around 190mil without previews. IW would have to do closer to 210 to break the OW record. It's possible, but unlikely. TLJ is a goner, though.