Real Doc Savage fans don't like this movie. As for me, I'm not a trufan, but I'll admit that mistakes were made. It could have been (and should have been) much better. When it appeared, I'd read several of the Bantam editions of the novels and enjoyed them as good pulp fun. The movie all too seldom captures that spirit, as the makers were apparently under the impression that they had to camp things up. A thumb-sucking villain who sleeps in a giant version of a baby's crib? Long patriotic speeches? A flash in Doc's eye? There are a lot more, but I don't include the John Phillip Sousa soundtrack. I love Sousa.
And the movie does get some things right: a lost tribe, an opening with an attempted assassination scene right out of the novel, the Green Death, the look of Doc in some scenes. It's all too mixed up, though. If they'd just played it straight, it would have been a much better movie.
I saw the movie in the theater when it came out, and I own the DVD, so I'll have to admit that I do get a kick out of it. I'm a mere Doc dilettante, though, as I said, and not a true believer. The movie's certainly not for everyone or maybe anyone but me.