The reason KM and PW don't get so much negative press and criticism is because they don't speak out their opinions as much, they stay neutral.
Just cautiously popping back on here... I had to take a break because there was some quite nasty stuff on here last night. But I'd like to respond to this, because I think it's true in a way. KM and PW do absolutely play the royal game in that they present a sort of relatable yet aspirational image, they're outwardly pleasant, and they don't take a stance on anything that could be perceived as political or controversial. And it probably helps that they're both British, as opposed to Harry and Meghan where Meghan is obviously an American - a Californian actress no less. So there's a cultural difference in how she presents and some of that doesn't land as well with the UK public, especially those who are more 'small c conservative'.
A PP said that she felt Meghan was initially not so much accepted as on probation and there was a sense of waiting for her to trip up. I agree with that. There was always wariness. And with things like the writing on bananas thing, which was well received by the charity involved but widely mocked in the press and on here, it just became part of the narrative. And the press is all about the narrative because that's how they connect with readers. Nobody can definitively say Meghan did this or that because she's being manipulative or because she's genuinely being nice. It's all in the interpretation. But to circle back to this point about staying neutral, Meghan and Harry are poles apart from Kate and William - they do take a stance, they left royal duties, they left the country, they objected to the bullying rather than just 'riding it out.'
As soon as you take a stance, some people will warm to you more and others will feel alienated. And personally I support what they've done because I can just imagine how intolerable I would have found their situation. When you're giving something your all and it's met with so much criticism and there are lies being printed which you feel powerless to address, that must feel terrible. So I don't think to myself, these are two privileged people, I'm punching up here, they need a reality check. I'm actually interested in their perspective and I'm open to it. It doesn't mean I think they're perfect, there are things I could criticise. But that's different to an approach of looking at one thing, putting a very definite spin on it (which is always going to be inserting an interpretation), finding something else that matches up with that, and so on, until you're picking on the tiniest things.
And you can say that someone is whinging or that they're hurting and wanting to put their perspective forward. Two interpretations of the same thing. You can put it into a context where it's two millionaires feeling sorry for themselves in their LA mansion, or you can put it into a context that Harry has had an incredibly tough time in some ways, and Meghan became deeply unhappy just like Diana and Fergie before her, because the royal family plus the British press is a pretty toxic combination.
I'm rambling on now, but I do kind of get why they're divisive. I just happen to like them and thought hey, a nice positive thread on here. How naive I was. 
But honestly, I do wonder why you would see 'positive thread' and think oh, this is the right place for me to come on and say everything I dislike about this person. How is that a) in any way necessary and b) not just incredibly rude and arrogant?