I doubt they are weak to the point of being unsafe; the reviewers are probably just dogging the Nighthawk's brakes in comparison to other bikes. As a newbie, they'll probably feel great right up until you ride something else.Thanks everyone for the replies I appreciate them!! I do have some concerns about the nighthawks braking, some of the reviews I've seen have said they aren't the best.. but everything else about it seems great. hmm.
I can't imagine any disk brake in good repair being dangerously weak, unless you don't have a lot of grip strength in your hand.