Fanaa

1st half me Aamir ko accha bataya, 2nd me bacche ko accha bataya. This was the succinct characterization of the movie Fanaa.
Megha has a slightly less charitable take on it at her blog, but watch out for spoilers.

My judgement is that Fanaa feels like the scriptwriter took a break at the interval and the movie was completed before he returned from it!

The 2nd half sucks & spoils the good entertainment from the 1st half. The less said the better.