Finally managed to see the movie last night (My local theatre situation isn't great), and I absolutely adored it. Not only was it a technical achievement in almost every area of 3D animation, every frame was stunningly beautiful. Stylistically I understand that not every animated film will be able to follow with it, but ITSV really sets a new standard. Not just for animated superhero films, but animated films, and superhero films. God, it made so many other recent films feel like crap.
Only two things that bothered me about it is that the movie can be visually overwhelming. Not chaotic or incomprehensible, but there's a lot going on in every frame. Viewing it in theatres is absolutely the ideal way to see it, and I expect people that wait for a home release to not appreciate it as much. My second issue is that they didn't get Paul Soles back to voice a character, he's pushing Ninety years old but he's still acting.