They did it. They overcame the odds, and they made a bad Tom Cruise movie. That's a *really* difficult thing to do... but they worked really hard and did it.
It goes wrong-- and gets unintentional laughter from audiences-- in a dozen different ways, and while there are a couple of pretty fun action sequences, the majority of the film looks and sounds like a TV show. It's like if Once Upon a Time did a season about movie monsters.
A shame, as Cruise, Boutella, and the genre of mummy movies deserve better.