Not to be Mister Critical Guy, but I have the exact same problem with both of those examples: They're people with funny hair. Their motivations, as you've described them, are human motivations. Why make them aliens at all?
Okay, in the first example there's energy-being stuff going on, and I respect that. Not having seen the movie I won't criticize it. But my bigger point is that aliens should be alien, otherwise they're better off being something else.
Lemme cough up some examples from books I've particularly enjoyed, so I can splain what I mean. Maybe there are excellent examples in TV or film that I'm just not thinking of right now.
I'm about to spoil some shit.
Earlier I mentioned "The Mote in God's Eye." In that novel, there's a species called the Moties ('cause they live around a star called the Mote, and humans can't pronounce their name for themselves), and their defining characteristic is that they breed uncontrollably. They're … urg. What's the word. They're like bivalves in that they change sex periodically. When female, a Motie has to become pregnant, or her hormone imbalance will kill her. So Moties can't control their population. They also don't have interstellar travel, so they're stuck in one solar system, with one planet and a handful of space settlements. Consequently, they've got a vast history of total war caused by population pressure. The Moties keep this a closely guarded secret, for obvious reasons.
Humans make first contact with the Moties, and find them both intelligent and generous. They offer to share freakin' everything with the humans in exchange for the secret of practical interstellar travel. The book is basically half travelogue (about the first embassy trip to the Mote) and half mystery (about the humans trying to figure out just what's up with the Moties). In the end, the humans figure it out — if they let the Moties out of their one solar system, they'll breed like rabbits and make devastating wars and just generally turn the galaxy into hell. They contemplate extermination, but decide instead just to blockade the Mote system … forever.
The Moties are probably my favorite aliens in all of science fiction. They're different. But not like incomprehensibly different. They're similar enough to humans that we can understand them and relate to them, but this one fact of their biology ripples out to give them a totally different society, history, outlook on life, set of values … everything. The intersection between human society and Motie society makes for a really great read.
Second example: "A Fire Upon the Deep" by a guy named Vinge. This book has more Big Ideas crammed in it per page than just about any other I've ever read. It includes a fantastic twist on the notion of applied theology. But in it there's an alien species that evolved from pack animals. They're sort of half-wolf, half-ferret. But the catch is they're only self-aware as a pack. Not like a herd or a hive mind, but a pack or litter of between three and ten individuals. On their own, they're just animals. But as a pack, they've got a mind. The individual members communicate through high-pitched vocalizations that happen below the conscious level; there are references in the book to packs being stunned into unconsciousness by noises that literally made it too loud to think.
As characters, the members of this species aren't radically different from people. Again, they're similar enough to relate to. In fact, Vinge kind of plays with that a bit, if I remember right. Some parts of the book are written from the third-person point of view of one of the alien characters, and Vinge doesn't go out of his way to explain just what these critters are. He just drops the reader into their world and lets you pick it up as you go. It's entertaining and original.
At the other end of the spectrum, there's this guy named Varley who's written several novels with the same setting — including my all-time, hands-down, never-to-be-defeated favorite novel ever period. In his books, at some point in the arbitrary future man has sort of lightly colonized the solar system. There are city-sized settlements on the moon and Mars and elsewhere, but almost everybody lives on Earth. One day vast and incomprehensible aliens appear in the sky and destroy all large-scale man-made things on the planet. Then they go away again. And we never find out why. As one of his books (or maybe book jackets) puts it, "Over the next month, two billion people starved to death."
This is pure backstory for him, not plot. His short stories and novels in that setting all take place years after the fact, with the remnants of humanity scattered among the moons and planets of the solar system. But as aliens go — and alien genocides in particular — that's a damn good one in my book. The aliens are completely incomprehensible, and they destroy our shit without ever giving any hint as to why, with all the deference — and probably all the concern — of a person treading on an anthill.
If you're gonna do aliens, have the balls to do fucking aliens, is what I'm saying here. Either make them fundamentally different from us in a way that, by itself, is sufficiently interesting to grab attention and that creates some kind of motivation for your story, or make them as different from us as we are from a hurricane and let the consequences be your story.
Anyway, that's more about my personal taste than anything, but there it is.