U2 regained critical success in 2009.
U2 . The group 's fifth album , The Joshua Tree ( 1987 ) , made them international superstars and was their greatest critical and commercial success . U2 regained critical and commercial favour with the records All That You Ca n't Leave Behind ( 2000 ) and How to Dismantle an Atomic Bomb ( 2004 ) , which established a more conventional , mainstream sound for the group .