Interestingly, it turns out that del Toro was originally offered the job of directing the film, but turned it down.
"You know, at one point or another, Larry Gordon and Lloyd Levin asked me if I wanted to do The Watchmen and I just couldn't get my head around The Watchmen being two or three hours long. I always thought that the series depended on almost-miniseries build-up."
del Toro did go on to praise the trailer's faithful recreation of the work, however. "I think Zack Snyder is a brilliant visual creator and everything in the trailer seems right - if not completely dead-on. To be absolutely honest, I even got a little bit of a geekgasm."
There you have it - del Toro dropped two bombs there; one, he was green-lit to helm Watchmen at one time, and two, he actually used the term 'geekgasm' in a sentence.
Check back with IGN soon for the full interview with Guillermo del Toro for his complete thoughts on The Watchmen and much more.