Moving Pictures is a pretty good album. Far from their best. Though I do like "La Villa Strangiato" -- I think it's on there. I'd consider them as "metal" as Zeppelin --hard rock anyway. Xanadu is IMHO their best song. You know it?
I haven't heard that one yet--there are some of their albums I haven't heard that I'd like to. I do know the Olivia Newton-John song of the same title :) What else do you listen to?