Did I like it? The answer would have to be yes, the mix of styles will put many people off, but I found it to be unlike anything I have ever seen, and all the better for it. The story is by no means original but everything else about the film is so different that this can be forgiven. To get one thing straight, Kubrick decided Spielberg would be the better man for directing it, and I think this was a very wise decision, many of the ideas are pure Kubrick, but Spielberg has the neccassary attributes to direct such a film, and great credit has to go to Kubrick for handing it to him.
Haley Joel Osment is amazing, the robot/human emotion must be amazingly difficult to pull off effectively, but Osment does it with such relative ease to the point where you do believe he is a robot, not that he is just acting as a robot. Jude Law is excellent, and so to is Frances O'Conner.
As for the ending, as brave as an idea it may of been to end on a downbeat note at "the first ending" I think the slightly upbeat ending is much more appropriate.
All in all I would say A.I is a wonderfully unique film that should be judged for what it is, a film. Forget everything about the Spielberg/Kubrick "issue" and just sit back and take in a truely amazing film. You may hate it, you may love it, but no matter what, it will effect your emotions in some way and you will discuss the film afterwards.
This film will be truely judged in 20 years or so, when it can be assessed purely as a film, as with 'Blade Runner', '2001', and even 'The Thing', it will get better with age.