Neither city has what I would call a nice theme park climate. Although neither does Orlando and that sure means nothing!
But you can weatherize and I wish I could give examples (I can't right now) where people wanted covered walkways and larger showbuildings that incorporated dining and retail so people would be indoors more and were shot down (largely by Woodbury). I wish the Chinese were being as forceful with UNI as they were with Disney and that could change. I know there was a lot of concern at Creative about the partners visit.
But it would seem Disney also didn't weatherize Shanghai as much as they should have. I think 90% of the pics I have seen since opening are showing the park in the rain.
If you like everything you see at UNI's existing parks, then you'll like this. The sad thing is the original plans were much greater in scope and more unique (like what Disney did) and UNI is totally playing this safe. I'm debating visiting UNI-Osaka on my upcoming trip to Japan and I have to say after talking to friends, I'm likely dropping it for now. Yes, there are 2-3 attractions that are unique and I'd like to ride Jaws again. But when I hear about the crowds and realize that a good 80% of the park is been there, done that (and not even changed at all from the US parks), I'd rather do more historical and natural sites.