 LaBrie's vocals on The Astonishing were singled out by many critics as being particularly strong. In their review, Loudwire elaborated, "A concept album with different characters puts a lot of pressure on the vocalist, and James LaBrie lives up to the challenge. From mellow crooning to Broadway belting to edgier singing, he utilizes every style in his arsenal and delivers a first-class performance." The band as a whole were also praised, although AllMusic observed that Mangini and bassist John Myung weren't featured as prominently as usual.
