"Frustrated fans" refers to people who are feeling upset, disappointed, or annoyed because of their favorite sports team, artist, or any other kind of entertainment not meeting their expectations or delivering satisfactory results. Full definition
You may be asking; is the vocal and frustrated fan base correct in their outrage? (videochums.com)
A prolonged dispute with its players frustrated fans, cost millions and put the sport's future on thin ice. (canadianbusiness.com)
The company attempted to calm frustrated fans with two free games and extended service plans for Qriocity users, but it was not enough to head off a lawsuit. (gamefreaks365.com)