I don’t like 3d because of Avatar, actually. See, I’m an as-yet unpublished SF author, and Avatar is hokum. But people went to see it because of its geewhiz special effects. Its box office take was inflated, because of the pricey 3D effect.
There are three things wrong with Avatar (apart from the immorality of its views on race and the military).
First off, why would a planet where the whole biosphere is networked evolve like this one, that’s “red in tooth and claw”? And the Na’vi, similarly, wouldn’t have anything like one of our hunter-gatherer cultures, their civilization began “Post-Scarcity”.
Second off, why do the Na’vi have four limbs, when everything else on their planet has six? There are those ape things with their upper arms fused, but Na’vi wouldn’t have human-looking arms—seals still have lots of traces of their ancestral Carnivora anatomy.
Third off, the Unobtainium thing makes no sense. If it forms naturally, it would almost certainly be easier to synthesize in a lab than to mine on a planet orbiting another star. If the humans in this story are so evil, why do they even give the Na’vi a chance to fight them, when rocks tend to survive fire-bombing? The only reason a modern military fights in person is if it’s trying to minimize civilian casualties. And finally, the mission to get the stuff almost certainly would not pay off (so again, it’d be easier just to synthesize the stuff): since their ship is fueled with antimatter, they could reenact the Moon landings, in a 1:1 scale set, only with the moondust replaced by the finest powdered heroin, for the same price as their gas money.
The fact the ship, in this baloney story, is the only one in all of SF to actually bother with heat radiators, just makes it that much worse.