Forget all the critics (though much of their criticism is technically on target). Watch this film with an open mind and revel in the sheer audaciousness of it all. Gruesome monsters. Trashy, gorgeous heroines. Square jawed men of action. Let the bizarre ennui envelope you. Enjoy the sheer inanity of the whole thing. I saw this as a teen and was utterly captivated by it and the crude power remains intact. On location shooting (in the Philippines) and cast of unknowns adds enormously. It's a wonderful piece of trash film making -- a classic of the sort.
Review of Mad Doctor of Blood Island
