Mainly due to how it's never boring cus it's got 1000 characters and just about every single moment of the film is showcasing at least 1 of them. So there's constantly stuff happening and it somehow manages to mostly not be a clusterf*ck.
And yeah all the character deaths in this will obviously be reversed in the next movie (the macguffin is literally a device that can alter reality after all. plus many of the characters who die have planned sequels) but it's still fun to see one of these movies where the good guys lose spectacularly.
Obviously don't go in expecting any cinematic mastery or anything. But as far as these types of movies go it's one of the more entertaining ones.