everyone says Polchinski is the best, and that's the only one I've tried to read. what about the others?

>Superstring Theory -- Green, Schwarz and Witten (1987)
>Introduction to Superstrings and M-Theory -- Kaku (1998)
>A First Course in String Theory -- Zwiebach (2004)
>String Theory and M-Theory: A Modern Introduction -- Becker, Becker, Schwarz (2006)

anybody have any feelings on whether any of these are better or worse than Polchinski? i've gone through polchinski a little and found certain things lacking and the pedagogical style a bit just "here do this" without enough motivation, as well as certain chapters where he goes "i don't explain anything here just state it as fact" which is annoying