Yeah I agree, the trailer is good, and I've heard no end of people say the same thing over the years (including those who I've shown it to). It's definitely a bit long-winded and not something you can quickly whip out to pull people in, but I can't see many people watching it and not wanting to play the game at the end.
I can't really say for sure how it would have affected my decision to buy though as it was a full-page magazine ad that lured me in. I wish I'd kept that actually — does anyone else still have an old magazine with it in? I'd love it scanned so I can see it again. ;D