It seems that it wasn't so much that they didn't LIKE him, as didn't RESPECT him as a Tsar. He wasn't able to inspire the same respect as his father had done. Perhaps this was because his was a gentler & more diffident nature. Sandro Mikhailovich was one of his closest friends, wasn't he? And even after Khodinka, it wasn't Nicholas that he & his brothers blamed, but Serge??
Perhaps by the time of the revolution, the entire family was despairing of him. (But again, I think it is necessary to separate the man from his role as Tsar, because as a man it seems they all liked him.)