Its unfortunate that I wasn't at my current age in the 70's and 80's when Mormonism was supposedly more "honest" about their teachings. The reason I say this is because Mormonism today is trying more and more to fit in with Christianity by making themselves appear more orthodox. I can say this from experience, because this past year I spent some time with Mormon missionaries. I didn't spend as much time in dialogue as I did listening to what they had to say.
I find it interesting that they spent a lot of time speaking about all the good things of Christianity. At one point, I remember them saying some very positive things about the reformation. It is as if they were trying to make themselves appear as just another Christian denomination; though they still claimed to be the "one true and restored church." But still, they claimed that they believe "basically the same things that Christians believe." I can assure you that the early Mormons, especially Joseph Smith, did not believe this. And its a shame that Mormon missionaries probably aren't as familiar with their historical theology as they should. The reason being, like some people I know, they will become a Mormon without knowing about all the odd things that Mormonism has taught.
In light of this, I think it is very important that we at least understand the basics of Mormonism so that we not be deceived into thinking that they are just another denomination. And I think the following video illustrates this well: