The problem with making users have to scroll past these huge carousel graphics at the top of the design, after perhaps waiting for it all to load, is that it unfairly hijacks the bounce rate analytics for your site. Those analytics are not just there to help you, they are also connected to the formula Google uses to rank pages.
So if users seem to be lingering for a long time on your site, it makes your site seem to be more useful and popular than it probably really is. On the other hand, sites that really do provide useful content may have their rank negatively affected by having a higher official bounce rate than your site. In consequence, Google is rewarding sites that actually do place useful content above the fold.
I’m noticing a bit of a backlash against the current trend of using huge carousels, which is a good thing. Hopefully, if designer’s realise that there might be some Google penalties attached to carousels, they may stop using them. That said, I’m not sure how Google would approach the problem of detecting where the fold is and how much content precedes it/follows it.