Janmaat pulled no punches as he assessed the performance on Wearside.
He told NUFCTV: "It was not good enough. The first half was really poor, we were too negative, so it was not good enough. The second half was much better, but it still wasn't good enough.
"I wouldn't say we didn't give everything. What I can say is we were not good enough and everybody saw that Sunderland were better, especially in the first half.
"If you are not good enough, then most of the time, you lose."
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