I’d honestly suggest everyone give this movie a watch. It’s just one of those films where the ending really sticks with you and makes you feel like we should all try to be a little kinder to one another. Those "aliens" you see at the very end? They’re actually robots that have evolved over the two thousand years following the main story.
There was some discussion here regarding the Spielbergian and Kubrickian elements of the film, and I think the text and video provided below might help clear things up for you:
"People pretend to think they know Stanley Kubrick, and think they know me, when most of them don't know either of us," Spielberg told film critic Joe Leydon in 2002. "And what's really funny about that is, all the parts of A.I. that people assume were Stanley's were mine. And all the parts of A.I. that people accuse me of sweetening and softening and sentimentalizing were all Stanley's. The teddy bear was Stanley's. The whole last 20 minutes of the movie was completely Stanley's. The whole first 35, 40 minutes of the film – all the stuff in the house – was word for word, from Stanley's screenplay. This was Stanley's Vision."
"Eighty percent of the critics got it all mixed up. But I could see why. Because, obviously, I've done a lot of movies where people have cried and have been sentimental. And I've been accused of sentimentalizing hard-core material. But in fact it was Stanley who did the sweetest parts of A.I., not me. I'm The Guy Who did The dark center of The movie , with The Flesh fair and everything Elsa. That's why He wanted me to make The movie in The First Place. He said, 'This is much closer to your sensibilities than my own."
http://www.movingpictureshow.com/dia...ergCruise.html
Video:
http://www.bbc.co.uk/blogs/markkermode/posts/AI-Apology