The Day The Earth Stood Still
The new one was so bad in such a strange way that I'm not sure if the producers/writers/directors/etc had ever even seen the 1950s original, or were just going by someone else's description. "Yeah, there's this alien that looks human and his big robot assistant guy, and they're here because humans are bad and stupid and screwing stuff up, and then they make us see what it's like to not have technology."
They screwed up the whole point of the movie. In the original, they warned us to quit being so violent and playing with atomic weapons. By making technology stop for an hour, we could see what they would do with us if we didn't stop screwing up. In the end, we were left with a message to change our ways before we go to far. The aliens were basically trying to help humanity by scaring us straight.
In the new Keanu version, the judgment is made, and punishment is given, and there is nothing we can do. Humanity is simply out of luck when Keanu-Klaatu changes his mind and we're sent into post-EMP apocalypse without a chance to prove that we might be able to live in harmony with nature or whatever. Because these supposedly wise aliens have a super weapon but manage to accidentally use it to harm humanity? Wait, WTF? I thought humans were bad because we harm other species by not controlling our technology, unlike the more advanced alien civilizations.
The end result wasn't the audience thinking "oh, i need to buy a prius and be green," it was "we better get some super space nukes to fight back in case these vindictive alien fucks ever do show up and go full retard with their giant robot."
Massive green propaganda fail.
Day After Tomorrow
This one is so over the top that it works better as a parody of the ridiculous claims made by the manbearpig brigade.