The Harry Potter stuff was truly amazing. Blows Disney out of the water, in what they have accomplished. Especially being in Gringotts bank felt almost surreal. I loved how Diagon Alley isn't even labelled, no signs. We almost couldn't find it for a few seconds, as it is truly a hidden alley in London.
Aside from the Harry Potter stuff, my opinions were more mixed. I have another thread in the Universal disboard with my thoughts.
Being here on the photography board, I am disappointed in how unfriendly Universal is to photographers. So many rides where you need to locker your cameras. And even when you don't locker your cameras, finding photography against the rules on it seemed almost every ride. I actually tried to generally obey the rules.. I didn't realize photography was forbidden at Poseidon's Fury until an employee saw me snap a shot and advise me.
Not sure if things are changing in theme park photography, or it's because of Universal policies, but I observed so so few dSLRs around. I actually did see a few Sony E-mounts... At least one other A6000/6300 besides myself, and 2 or 3 A7's. But I don't really remember seeing anyone with a traditional dSLR. (Of course, lots of people using their phones).