While I have nothing against sports metaphors myself, one drawback that I can see is that people unfamiliar with the particular sport might not be able to understand them. Indeed, I'll admit that I'm completely ignorant of baseball and do not know what "swinging for the fences" means. In fact, I only know that this was a baseball reference because of another comment.

1) It's cliché.

2) It's confusing to non-native speakers.

3) It's confusing to native speakers, too.

4) Baseball has nothing to do with the subject at hand.

5) It reeks of inaccurate, droning marketing-speak.

6) It cheapens the industry to resort of sports-derived metaphors.