They left out all of the humor that was used so effectively in the Polanski version (Minnie's quirks, Roman's and Minnie's bickering, Laura-Louise sticking her tongue out ...)
One of the things that made the original a classic.
Yes, I didn't like the Margaux character so much.
Also, they changed quite a lot which didn't compromise the story but showing the baby was a flaw IMHO.
Adrian had his father's feet and hands which are supposed to be beast-like, complete with a tail and horns. Not that blue-eyed cute baby we're shown.
Part of the suspense consisted in NOT showing the child.