I've only seen Jurassic World, and that's a fantastic movie no matter what people say people seem to think the Jurassic Park franchise is something more than just an excuse to see people run around and try not to get eaten. Sure, Lost World and III aren't great movies, but Jurassic World had just as much charm and fun as the first .
The thing that bugs me about Trevorrow getting the ax, is not that it happened, but how people are reacting. This early on in a film's development, it's not uncommon for directors to come and go. I bet a lot of this had to do with Carrie Fisher's death. Episode IX probably needed huge rewrites, and while Trevorrow's script for the original version was good, everything that has happened has caused major problems for that script, and obviously he and his writer couldn't fix it, hence the firing. Stuff like that happens. Had the director troubles on the Han Solo film not happened, this wouldn't be as reported on as it is. The Han Solo film, now THAT is a weird situation that deserved it's media attention.