Of course. the point here is that the
LDS church believe that the bible is the Holy word of God.
Bit of a sticking point.
Not really. I think you're missing the concept, which I guess is mind-boggling for those who are used to normal Christian culture, that the LDS church believes that revelation is ongoing. To them, modern revelation is just as scriptural as what's in the Bible. God can speak to prophets today just like he could in Biblical days. God could make a new pronouncement tomorrow that's just as official, binding, whatever you want to call it, as anything printed in the Bible, in the same way that he dictated the Bible.
I'm not getting such a divine, "direct word of God" feeling here.
That's probably what a lot of people said when some random Jewish guy started spouting off all these things that contradicted the Torah circa 30 A.D.

Obviously you're not. I'm not either. But obviously lots of people do, from both the Bible and/or the Book of Mormon, and they think their personal opinion is just as good as ours.
Direct word of god would be god writes down what he is saying in a gold (or any other kind of book) in contemporary language.
That's no different than a Mormon defining what it is, or a Jew, or a Catholic. It's just one person's opinion.
As folks here would say: Evidence.
There is no evidence for what the direct word of god is, because there's no evidence for god, so once one accepts the premise that there is a god, the field is wide open to define how he communicates with people.
The direct word could be the voices a schizophrenic hears, it could be what's written in the Bible but nowhere else, it could be what a certain human says. Each religion can make up its own definitions.
The book of Mormon was translated from words apparently of an indigenous American prophet circa AD 400.
You're missing the part where Mormons claim it was translated by divine inspiration. In other words, the Bible was translated by men, while the Book of Mormon was translated by God.
On top of all of that it's revised in later editions so just how divine and accurate can it be? Polygamy(?) really?!?
Um, I think your ignorance of LDS doctrine and history is showing here. The Book of Mormon hasn't been revised with any significant changes, other than a few words here and there, and putting it into chapters and verses rather than plain text.
Possibly you're mixing it up with the Doctrine and Covenants?
You seem to be coming at this from a modern Jewish-Protestant/Catholic-centered view, starting with a baseline that the "normal" Judeo-Christian viewpoint is okay, but anything besides that is weird. I'm coming from the viewpoint that all religion is equally weird, so I don't see why polygamy deserves a "really?" any more than, say, "cutting off the foreskin? really?" or "dunking kids in water? really?"
The bible is considerably more accurate and has archeological, historical evidence to complement it... (Not that the bible is worth the paper it's written on either imo but hey)
As far as I know, the Bible is more accurate because it had the benefit of being written by people closer to the time and place when most of it is set, but it still has major historical errors (even outside the supernatural stuff), due to things the authors couldn't have known or were transcribing as legends.
The Book of Mormon suffers from the fact that Joseph Smith was writing about a period he knew virtually nothing about, so of course there are more mistakes.
If you want accuracy, check out the Doctrine & Covenants. Joseph Smith doesn't make
any anachronistic blunders about the 1830s, the time period that his writings in there are set. And it's the same for the writings of every prophet since, when giving revelation about their own time periods. It's a miracle!
Bottom line: People who are used to traditional Judiasm-Christianity aren't used to what it's like to see a similar religion start virtually from scratch within the last 200 years. I guess the patina of a few thousand years somehow makes the newness and strangeness of the Bible less obvious, so it now sets the standard for what's "normal" in religion and anything else is weird. But folks, it's
all weird.