This was placed as one of the worst comicbook movies recently
I can't remember the site other than that of the worst 20 comic book movies it was number 20.
Anyways the reasons
1.Not enough development by that I assume they mean we never see Lamont Cranston in trainning. Ok I don't think that should be a reason for bashing the movie. During this time period super hero movies they went with screw putting the origin in and everything before they became a super hero.
2.The Villain's role was sterotypical If having a Asian American play a evil ruler, conquerer, dictator, etc is sterotypical then by that logic these same people would bash The Mummy Returns because there it is again a Asian American playing a evil ruler.
3.It was a box office Bomb. It didn't make as much as it's budget.