Finally got round to seeing this last night on DVD.
Positives: Excellent performances, exquisitely stunning photography and post-processing or colour timing or whatever they do these days, editing top-notch, fantastic sense of despair, superb effects.
Negatives: After-thought voice-overs at beginning and end to explain the plot to dimwits. Spielberg and his constant heavy-handed nods to the fractured family and absent father figures enough already! Overtly playing on 9/11. Basement scene too protracted (did we need to see the aliens come out of their machines at this point?)
Still, beats the hell out of AI.