When you start out as an actor, you read a script thinking of it at its best. But that's not usually the case in general, and usually what you have to do is you have to read a script and think of it at its worst. You read it going, "OK, how bad could this be?" first and foremost. You cannot make a good film out of a bad script. You can make a bad film out of a good script, but you can't make a good film out of a bad script.