One word. Attitude. She seems to have mellowed a bit recently, presumably thanks to a combination of marriage and pregnancy, but she still doesn't come across, in my opinion, as a particularly warm-hearted, naturally friendly sort of person. Maybe she's a lovely person once you get to know her, but I don't see much evidence of that in the way she conducts herself in public. Sorry to any Mel B fans who're reading this, but that's the way I feel, and the only person who can change my mind is Mel herself.