Went to see it earlier today, on the largest screen with the biggest sound in our local Cineworld. It really was good. The effects were faultless and when necessary huge, the atmosphere was pretty convincing, the acting was high-grade (even the dog !), the plot worked.
If it came second to the first one then that was mostly in the only way that it simply couldn’t avoid - the first one was novel in so many ways. It was impressive because we went into the cinema not having seen that kind of a future before. When we came out of the cinema we had. Any sequel was never going to be able to open our eyes that way again. But with that proviso I think it was great.