By mainstream Christian standards, the doctrine is, quite frankly, "heretical", but members of The Church of Jesus Christ of Latter-day Saints (the primary branch of "Mormonism") very much consider themselves Christian, have values that align strongly with many other Christian denominations, place Christ at the center of their doctrine, etc. In my opinion, culturally, we're a lot more Christian than the typical perception would suggest.

That being said, we've got our own offshoot groups that we don't consider "really Mormon", so I get where people are coming from on that question.