Entertaining, but with some problems. Kevin Hart's character/Fridge was a waste. He didn't have an arc and I'm not sure if we're supposed to believe he was changed at the end? That he's now friends with the nerds?
The camera loves Karen Gillan though. Man, she was super hot and you never really realize it when you only see her bald with blue body paint.
Cheese was right though, Jack Black and the Rock owned this movie, especially Black. He did a great job.
2 other nitpicks: the villain was not good, Bobby Canavale is usually pretty reliable as a villain, but he was boring and not really very scary. And there was barely any animals 3/4 of the way through the movie, which I thought was odd. They were mostly fighting the faceless motorcycle guys. They made up for it at the end though.