Usher kicks off 10-night London residency, with mixed results

Mark SavageMusic CorrespondentGetty ImagesUsher has sold more than 100 million records worldwide, and his 10-night stint at the O2 has completely sold outUsher has kicked off a 10-night residency at London's O2 Arena with a slick, two-hour show that was impressive and frustrating in equal measure.The US pop star played more than 40 songs, including hits like Yeah, Burn, U Remind Me and OMG, with multiple costume…