Everyone learns a different something from those kind of speeches. If you find the man impressive, you'll find what he says convincing; if not, not.

By definition no public speech can present and analyse the evidence for any policy, even when it comes across as doing just that. (And I don't say that because it is Bush - I think it'd be just as true about a public speech by someone whom I really liked, and who generally seemed to say things I agree with.)