There's this really great scene between the mom and a female psychologist/paranormal investigator wherein neither woman judges the other and they just have a philosophical bonding moment together wherein they obviously see one another as people doing their best in the world. This is the kind of moment you hardly EVER see between women in film. Kudos, Spielberg!
Minorities: there was one person of color and he was a side character, but he wasn't shown as inept or stupid and he didn't die, so half a point, I guess.
The only downside to Poltergeist is that the horror aspects of the film ramped up unexpectedly to 11 in the last half hour. As soon as you hear the little girl deadpan, "No more." I think the film should have gone to black. When I rewatch it, that will be my stopping point, I think. I liked that the horror was offscreen for most of the movie. Just when you think everything has been resolved, all the sudden they throw every possible horrific thing at the viewer and it's really overkill, for me anyway.
Overall, I recommend this movie. It's a philosophical horror movie with heart. I can dig that.
Aesthetics/Visual Effects: 3.5
Treatment of Women/Minorities: 4.0