At first glance it’s really dumb. And at second glance, it’s also really dumb, but like that really funny kind of dumb.
It’s like Hot Rod, which I actually love though many find it too random (only 64% on Rotten Tomatoes), but with more plot and much less randomness. Though to be fair, Popstar only has 64% on Rotten Tomatoes, too, but only because I only go by audience score. The critic score is higher.
Samberg is Conner Friel, a previous member of a popular rap threesome, The Style Boyz, who’s recently gone solo, but doesn’t have a clue how to make good music without his group. But the music he does make, is hilariously terrible. Also, every publicity stunt he attempts to increase his popularity fails terribly — especially the one with his girlfriend, Seal and wolves.
Of course there’s a positive message of nurturing friendships despite stardom, but you’re not going to watch it for that. Watch it for the stupidity, and you won’t be disappointed.