Wow lots of replies. Cool.
But still, even though you can put it into a sentence, and say 'ich liebe Deutsch' doesn't make it correct. As I have been writing, I think that it's actually overused and incorrect in this context, because 'lieben' doesn't have the same connotations as 'love' does in English.
As I said before, if one loves a parent, that is different from loving chocolate, but the same word is used. In German, I'm pretty sure, that no distinction is made, meaning 'lieben' has only one meaning and one connotation. Therefore to use it in the context of a subject would actually be an embarassing exaggeration.