Finally saw this tonight. I must say I thought it was only average. I would bunch it with the early 90's thrillers such as Single White Female, Hand That Rocks the Cradle and Basic Instinct. It certainly wouldn't warrant a second viewing. One question though:
SPOILER BELOW
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Why didn't she just open the panic room door to call the police from her mobile (which she has just retrieved) when the 3 intruders were arguing downstairs at the bottom of the house. With her daughter watching the screens to warn her if they came back upstairs she had at least 4 or 5 minutes in which she could have done this ?