I was just thinking, if my DH thought those things about my mother, or didn’t want my mother to come for Christmas, I would be upset
But that's a bit unreasonable you love your mother (if you love her, obviously I mean in general, not just you, OP) because she's your mother, and you've always known her, and have grown up making allowances for her foibles, understanding what causes them etc etc. Thinking that it's realistic for someone who only knows your mother because they married you to feel the same way is a bit mad. You might be lucky and find your DP's parents are great, but equally, you might not.
Both DH and I are deeply realistic about our own parents and one another's, although we are fond of them. He is more easily irritated by my mother's extremely passive 'I don't mind' attitude to life, because he hasn't learned, as my sisters and I have all our lives, to cut through it briskly. Likewise, he has childhood good memories of a shared passion for sport to set against his mother's dogmatism, annoying small-mindedness and lack of imagination, whereas I don't and I just find them irritating.
Perhaps the key thing is that neither of us is the kind of spouse our mothers would have chosen for their children at all. My mother would have liked a nice, jolly, teetotal electrician or plumber who kept me local, preferably with a large number of children and 'let me have a little job'. His mother would have liked him to marry someone who deferred to her as matriarch, lived nearby, was a SAHM with a lot of children, hosted family occasions in my shiny kitchen and went to Weight Watchers with her.
Instead both mothers got a couple with multiple postgraduate degrees and demanding professional careers they don't understand, who have lived in several different countries over the past few decades, and had one child by choice late in life. 