Very, very good. The only flaw I see is some awkward dialogue in the screenplay, which must have looked good on paper but doesn't sound so good on screen (lines like "A thousand miles of fiber, yeah.")
Re: the ending: I don't see why people call in "Spielbergian", though I also think that the idea of a heartwarming, sugary "Spielbergian" movie is based more on a persistent and undeserved stereotype than anything that's actually in his films. Just like
Close Encounters of the Third Kind, A.I. has a dysfunctional family that has smiles on its surface but twistedness lurking beneath, and in which all of the family members love each other only when it's in their own self-interest. In the first act, David is a robot who's programmed specifically
not to be self-interested. His process of becoming human (see the references to Pinocchio throughout) is also the process of becoming selfish.
In the third act, which I believe is absolutely necessary to complete the film, we see the consequences of that selfishness. David chooses to "resurrect" his mother, even though he's advised against it, no matter what the consequences are, with no consideration of how she might feel about it (she certainly doesn't seem to like it), and no matter if it's in the absence of the rest of her family (which he's continually drawing her attention away from). He has become selfish and has therefore, by the logic of the film, become human. If anything, the tearjerking moments in which David reunites with his mother are caustic, rather than sincere.
In addition, there's an Oedipal complex established in the first act of the movie that gets resolved in the third (David "imprints" on his mother, not his father; David covers himself in perfume in order to draw his mother's attention toward him when she's going out with his father). In the third act, the father's finally out of the way (the narrator even states this directly), and David finally gets to jump into bed with his mom.
Flynn said:
The inclusion of Ministry shows just how fabulously out of touch Spielberg is.
Actually, Kubrick had also planned to include Ministry in that sequence if he'd directed the movie--apparently, he was impressed by Ministry's sampling of dialogue from
Full Metal Jacket on
A Mind is a Terrible Thing to Taste.