Here is a story written by an LDS member two weeks ago about Mormons seeking to convert to orthodox Judaism. It's very well-written and also fairly represents the Jewish reaction. I'm glad to know both sides are in agreement!
In summary, "One can only reconcile the two [faiths] by watering down and distorting both LDS and Jewish doctrines, and it won’t work. When we try to build bridges between the two faiths, we can’t do it by trying to create a hybrid religion. Both Judaism and LDS Christianity deserve better."