Yea, the movie is similar (in my mind) to an "Unaired pilot" Special Feature. Like when they put together a Pilot and decide to retool it by recasting some or all the roles, and switching a few things around. When looked at in that respect, it's actually pretty excellent, since alot of those unaired Pilots aren't that great, and Stargate is a decent movie in it's own right
The most amazing thing about the film is the scale of the sets. I also love the cinematography. And I think it has a more suspenseful atmosphere all around.
Imagine the TV show with the look and feel of the film. That would be awesome.