Review: U2’s Limp, Disappointing ‘Songs of Innocence’

Once—long ago, but not so long that you can’t faintly remember—U2 kept two steps ahead of the curve. On the band’s best works, from way back in the mid-’80s and then on into the glitzy ’90s, Bono and Co. showed a curious knack for predicting but never trailing behind popular music trends. 1984’s The Unforgettable Fire…