Creepy freeloader and children are not a good mix for a rock band

Rating: 3/10 (20 November 2016)

Jack Black is one of those actors who always play slight variations of themselves. He could be described as a character actor or less nicely, an actor with not much of a range.
Not surprisingly, in this movie he is an obnoxious, selfish, immature guy who sings in a low-level band and exploits an old friend for free lodgings. When the girlfriend of said friend asks him to pay the rent, he resentfully set out to find a job. Said girlfriend portrayed as an unpleasant bitch, only because she makes a reasonable request...
Through a series of implausible events Jack (apologies, I mean Dewey) ends up teaching rock to a bunch of kids in a posh school. Not because he likes teaching but because he needs them to be his "support band" for the battle of the bands, since no legitimate rock band would have him.
It is quite creepy to hear a grown-up man telling pre-pubescent girls they could be groupies, not to mention the manipulation of kids for his own purpose.
At the end Jack (I mean Dewey) acknowledges that the band is more important than any single member, but throughout the movie we see him in every single scene playing the only "cool" character among a bunch of boring, nasty, square people of all ages.
Besides Black being totally predictable, the screenplay is even more so. Finally, for a comedy there are very few real funny moments. The only saving grace is the music, with a totally unexpected bit from Led Zeppelin exploding in a scene.
For die-hard Black's fans and people who think being a freeloader is a cool way to live. P.S. also probably the worst Linklater film.