I'd say the humor was pretty much on par with the first film. It was certainly funnier than the last film (they really didn't give Craig Ferguson much to do there). But I tell you, it's one of those prequels were everything looks bigger, shinier and better than the predecessor that takes place in the future. Sully had more rendered hairs than ever before. It was really a beautiful looking film. The character designs were some of their best.
Seems this is their last sequel/prequel til Finding Dory, and they haven't announced another yet. They haven't announced anything past Dia de Los Muertos. And rumor has it they have to change the name because they wouldn't let Disney copyright the term. Yes... Disney tried to copyright a Holiday.
Somehow, Pixar seemed intent on sticking it to Eisner by making Toy Story 3, Monsters University and Finding Dory. After all, Circle 7 animation was supposed to make cheap DTV sequel versions of those films.
As for World War Z... it's probably a good film and all, but it came out at a time where zombies were on the way out. When commercials for PC processors start doing the zombie apocalypse thing, it's like someone's old uncle that just discovered a Rick Roll three years later in September. The trailers hid as many zombie references as possible, and it made the film look worse, actually.