It all depends on the strategy you're using. If you prefer to slug it out toe-to-toe, then a warship has its advantages there. However, if you have a fighter type (like the Azdara) then it's wholly inappropriate.
Better to out-run the missile than be hit by it, I say.
But that's just my opinion, let's not get into a 'best ship' flame war. You guys seem to be more mature than most of the other boards out there (and most of them are almost dead anyway) but if we get into a flame war, then all that goes out the window. Face it, if you're flaming on one point, you'll start flaming on other points.