It's not "bad", but definitely far from being good.
X is like Y. Why? When? How? Nothing is even explained or even hinted at, other than "yes, x is y". All of the previous movies explain at least some of what's going on, why it happened, and how it happened. This one doesn't, which is lazy and, to me, very poor writing. The CGI is great and no over the top, the acting seems believable, but good Lord that story is awful.