I do not think they are Muslims and I have explained the differences many times
those who does not know please watch this video
Biggest Difference Between SHIA ( shite ) and SUNNI (Muslims) - yemen muslims hamtramck islam
http://www.youtube.com/watch?v=uYnD12urtBU

This also very intersting
Abdur Raheem Green-Why i did't become a Shia?
http://www.youtube.com/watch?v=_xfWckyfI3g&feature=related

Here is the most intersting one for you Nic
SHIA PROOVEN KAFIRS FROM THERE OWN AUTHENTIC BOOKS THEY DONT BELIEVE IN THE
http://www.youtube.com/watch?v=ogR9Bi0v89Y&feature=related