PrincessFiorimonde, you do indeed sound lovely, and I too would like you for a MIL!
Unfortunately, I echo what Sassy has said about hers.
A true test of the BU or NBU-ness of MILs (and DILs) would be if all those threads telling tales of woe and familial trauma were couched in such a way as to not mention the fact that we were talking about MILs.
I give my example to the pro-MIL faction
"So, I was introduced to this old lady....she seemed very nice, gave me a cup of coffee, showed me all the photos of her children, invited me for lunch, which I accepted.....A few weeks later, can you imagine my horror when I discovered that this said old lady had got on a bus, gone to the school where I was teaching, asked to see the head, and told the head that I was a no better than I ought to be tart (prostitute was the exact word she used) very possibly on drugs and was trying to wheedle my way into her family in order to make off with the silver, and as such, surely the head could see I was really not the kind of person she should have in her school influencing impressionable youngsters. I later discovered (many years later, in fact) that during the same period, she had been to the apartment block where I lived, knocked on the doors of all my neighbours and told them the same"
AIBU to think this woman is a psychotic witch and I'm better off without her in my life?
Y'see, it's nothing to do with being MILs, it's to do with being decent human beings. Some MILs (and DILs) are, some aren't. QED.
(same woman, when told we were going to have a passport done for dd in order to take her to the UK to visit the other half of her family (for yes, I did foolishly forgive the prostitution thing) told me "this baby is Italian, and stays here. If your family want to see her, they can get on a plane". That was 6 yrs and 3 mths ago. I haven't seen MIL since that day.) U? Moi? So be it.