Aileen (and Janet), I think you are spot on here. There is a difference between criticising a particular dancer's technical accomplishment (or otherwise!) or dramatic interpretation of a particular role, and criticising the individual, and for me this particular review crossed that line.
Saying that, I haven't seen Nehemiah in In The Night as yet (I'll ge tthe chance to on Wednesday!) but I have enjoyed many other performances where he was dancing, both with the Royal Ballet and before. In particular I remember his first performance with the RB in Swan Lake with Zenaida - I thought I was pretty much swanned out by that stage, but by the final curtain I was in tears...