Dobara is one of those movies that are short in comparison to most other Indian movies, but still appear to be longish. The story is pretty thin:
Ranbir and Anjali are a happily married couple, and then suddenly out of nowhere appears Ranbir's ex Ria, who has just escaped from a mental asylum. Ria wants everything to be like it used to be, and tries to manipulate an unwilling Ranbir into renewing their relationship. That's about a last thing Ranbir is waiting for, but because Ria claims she and Ranbir have a son of thirteen, he decides to go with her anyway and meet him in Goa. A jealous Anjali follows them. For a while, the story revolves around the question whether this son is real or imaginary, followed by a not particularly imaginative or unexpected twist, and at last all players are best buddies and Ria is miraculously cured.
The question of the true nature of Ria's disease is left unanswered, and apparently there's wasn't much research done about the subject. In other words, the whole thing is way too boring for a fairytale, and way too improbable for a story about a mentally diseased woman.
That said, the three protagonists did a bang-up job. Jackie Shroff is very a gifted actor, who played his part naturally and convincingly. Same can be said about Mahima Chaudhry, an actress who deserves much more recognition than she is actually getting. Raveena Tandon had her great moments too, although at times she was gravely overacting. However decent the acting may be, it doesn't weigh up against a weak and little exciting story. Since visually and musically this movie has little to offer either, I'm sure it doesn't add anything of value to anybody's film collection, unless he is a special fan of one of the actors.