We live in the age of sequels and remakes, with each, most of the time, being worse than the last. The Hangover series, for instance, used the same formula for the first two movies, with the second just being on a larger scale than the first. That's the joke in 22 Jump Street, this plot in this movie is supposed to be exactly the same as the first one, but bigger.
The movie starts with Tatum and Hill being briefed by their captain about the success of their first mission in 21 Jump Street, which gave the department a bigger budget to expand the Jump Street project. Now, the two cops are assigned to go to college undercover, and do the exact same thing as last time. The movie moves pretty formulaically, with the characters drilling into our heads that nothing will be different about this drug bust. The film completely acknowledges that it's a sequel, with jokes that land pretty well. While nothing about this movie is too different, the fact that it doesn't take itself seriously makes it immensely more enjoyable.
The chemistry between Channing Tatum and Jonah Hill is as funny as ever, making us remember why we enjoyed the first one so much. Tatum plays the jughead jock, while Hill plays the nerdy, straight-A student. They find their own groups, but ultimately, after drifting apart, they find each other yet again. Ice Cube plays a bigger role this time, which is fun, but his abrasive personality and constant yelling does get old after a while. It's hard to talk details about what I liked about this movie, but honestly the caption says it all. It felt the same as last time, but bigger and sometimes funnier. If you enjoyed the first one, you'll enjoy this one. They are so similar, that they even have the same 85% rating on Rotten Tomatoes right now. They are the same, but that's the big joke, so it's okay.
(This movie is rated R, and definitely isn't a family film. Don't take your kids.)