One of those (perhaps too frequent) oddball Hollywood epics where, the first time you see it, you go "what were they thinking?" But it deserves a second glance. This film is in the grand tradition of the famous 1940s fantasy films like THIEF OF BAGDAD 1940. Flaws and all, it also works as a love story, and you can never have too many of those. ((Designated "IMDb Top Reviewer." Please check out my list "167+ Nearly-Perfect Movies (with the occasional Anime or TV miniseries) you can/should see again and again (1932 to the present))
These films are neither as logical as a STAR TREK saga nor as linear as an Indiana Jones adventure. By nature, they tend to jump around, they tend to be a bit wacky, and they often encourage outlandish performances from their stars.
Which is what we have here. The #1 A-List name star, Gerard Butler has arguably never been more unrestrained in his career. He gives the impression that, after he takes over the world of the living and the world of the dead, his next target is Hollywood itself.
In fact, the lesser known stars give the better textured performances and connect with the audience.
Give it a chance -- as a love story that riffs off some extremely misunderstood Egyptian myths and succeeds in spite of itself, it works a treat.