Why 2.5/5:
The good: SRK, his action sequences mainly and his witty one-liners. Don?s maneuvers making you expect a twist always (esp with foe turned friend Vardhaan), the action in general and the climax.
The bad: Slow screenplay, stolen Hollywood ideas, not enough breadth or depth of characterizations for Priyanka Chopra, Boman Irani and Om Chopra, unwanted 3D picturization with no real special effects.
My detailed review at sunnysaidso DOT wordpress DOT com