The new movies definitely aren't bad. They might not all be mind-blowing, but they're solid, and Rise is clearly the worst in most ways (Rogue One has some big issues despite people like it, but that's another discussion). What's curious to me is, in general they're a lot better than the Marvel movies, especially the first "set" of Marvel movies, but the response has been less positive and I think a lot of that is because of two groups - Gen Xers who think they "own" Star Wars (especially older Gen Xers), and that their vision of it (often massively shaped by EU stuff zapped when Disney bought Lucasfilm) and Zoomers who think the Prequels were "Pretty cool actually" (lol) and kind of object to anything that makes the Prequels look bad (which is to say, pretty much all other Star Wars stuff except maybe Clone Wars which is Prequels era, but even it kinda does), or anyone who says the Prequels were bad. More people feel ownership of the SW stuff than Marvel stuff. Give it 15+ years and attitudes to Marvel stuff will likely be similar.
And you're right re: the Blizzard IP. I think if they bought it they'd probably re-work a lot of the characters, and the setting. In the grand scheme of things the changes would likely be tiny, but I'm sure they'd rile up some nest of angry fans, who would be incredibly loud and venomous, no matter how few in number. Whether that even matters is another question. I suspect not. But I think people who have a "Well Disney would do a better job than Activision!!!" would be in for a really rude surprise if that actually happened.