When I look at the typical three act structure, nine times out of ten, I know how the third act is going to end before I even start to put pen to paper. Or fingers to keyboard in Final Draft.

I find the advantage of this is, in knowing the pay off, I can work backwards to leave the proverbial breadcrumbs for my characters to follow or discover.

I can set the pace in reverse, I can set the height of the obsticles to over come in reverse. If you start with your best idea, you have nowhere left to go, so end with your best idea, but start with a bang.

Rule of thumb for a 90-120 page feature; you have to have them hooked by page ten. End act one with a big question. End act two with a change of direction.

If Robert Mckee is such an expert on writing books on screenwriting, why isnt he writing Hollywood blockbusters?

If you want good dialogue, watch anything written by Shane Black.
My two cents.