I did indeed watch the pilot last night and I thought the show has quite a bit of potential. I definitely liked how a lot of the elements of The Omen were present, and by that I don't just mean the flashbacks to the film itself, but the score, the guardian dogs (though they do give Rottweilers a bad name when the ones I've met have never been anything but friendly), and, of course, the characters who get wiped out because either they know too much or want to know too much. There's nothing like a good inventive death scene - and The Omen films have had many, and the pilot certainly had one.
I suspect, though, that if someone didn't like The Omen or if they haven't seen it, chances are that's why they didn't necessarily like the pilot. The pilot does rely heavily on things that happened in the first film - and even though there are flashbacks, they don't completely flesh out the mythology. But then, maybe they've done that on purpose so that they can further explore things as the series progresses. All I know is that I will be checking out more eps to see how things progress...