its would be very unusual to have an over active servo unit and normally if they fail they iether cause the brakes to be on all the time or lack any assistance.
Brakes have to be taken seriously and cannot be judged without someone actually driving the car. If you really don't feel confident then you shouldn't drive it untill it has been inspected and deemed safe. If you are involved in an accident and it slips out that you were unsure of the brakes you could be liable for driving a vehicle knowing it had a possible defect.
Don't wait a week get another opinion even if you pop along to a nissan dealer and just ask if they could run it round the block.
My suspicion is that its just different to your last car and the pedal is a lot more sensative and you will need to adjust accordingly.
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