criticism

Ability and criticism
Being a large thirteen member boy band, the members contain a variety of different vocal ranges. Some members are credited for their vocal belting techniques, notably Yesung.[h][63] Leeteuk, Heechul, Han Geng, Sungmin, Donghae, and Ryeowook sing within the stretch of a high baritone range to the tenor range, while Kang-In, and Siwon sing in a lower baritone range. Shindong's, Kibum's, and Kyuhyun's vocals lie in the bass range. Eunhyuk, Shindong, and Kibum are also the known rappers of the group due to their rhythmical vocals and quick tongue. Heechul and Donghae consistently rap as the supporting vocals.[i]
Super Junior has been criticized in the past for lip-synching and lack of vocal skills, specifically for shaky pitch and heavy breathing,[64][65] The criticisms worsened in July 2006 when they lipsynched on Show! Music Core of MBC, a show that guarantees all live performances. Though fans have defended them saying that Heechul was ill, their critics do not accept this explanation. They argue that since the band contains thirteen members, one ill singer should not necessitate lipsynching by the entire group.[66] Despite this, they have still remained popular through their large fan base and their album sales have been strong. Pushing back the criticism, Super Junior's comeback performance with "Don't Don" was a live performance instead of lipsyched.[67] Out of the thirty-some songs that were performed at the group's first live concert tour Super Show, only six songs were lipsynched, acclaiming positive reviews for the concert.[68] Some members have also been performing a cappella versions of their songs despite vehement disapproval from the public
source:Wikipedia