The worst crime a procedural can commit is being boring. Above all else, a procedural has to be interesting—whether through action, characters, or its premise—in order to mask the mundanity of formula. Unforgettable attempts to be interesting through its premise, a woman who can remember everything except her sister’s murder, but fails miserably. The execution is stale and nothing stands out. The crime is boring, the characters are boring, and the memory thing is boring from beginning to end. The main character stands there, looks at a freeze frame of herself at a particular moment, and finds a clue to that leads her forward. I don't see the appeal in that.
Poppy Montgomery is fine in her role, and there wasn't much to do with such a lifeless script. I've watch tons of procedurals and I can't remember the last time there was an episode this boring from all perspectives.