I agree with Terrifel: it’s both.
Cool:
*Computers eliminated
*Shields mostly eliminate use of projectile weapons
*Bene Gesserit/Kiwsatz Haderach
*“Fear is the mind killer…”
*The effects of spice
*As everyone has pointed out, planetary ecology
*Some pretty cool characters
*Fremen tribe, culture well described
Stupid:
*The shield/lasgun thing. Doesn’t make sense from a physics point of view, and is totally unnecessary anyway. The shields should just be able to block laser light.
There are already atomic bombs that the houses have pretty much agreed never to use because the weapons are too powerful. Since the laser-shield interaction would be an equivalent weapon, I see no reason why lasers wouldn’t be banned in the first place. Dumb.
*Everything so frickin’ high and mighty. All these dukes and nuns and what-have-you acting in such a fancy-pants manner. Paul Atredies never cuts a fart, Alia never cracks a joke. Serious to the point of psychological unrealism.
*Water scarce on Arakis. OK, it’s a desert, and water is basically scarce, but that shouldn’t impact the humans who, after all, migrated there via spaceships that are capable of transporting water. Even if the Fremen had gotten there in rinky-dink spacecraft and been stranded there a long time, at the time of the story they were in a position to get as much water as they wanted. Had others wanted to bring a lot of water to Arakis, they could have done so too.
But, overall, a decent book as I remember it. Don’t know how it would seem now.
The sequels unequivocally suck, however.