The surge of energy and enthusiasm , both onstage and off was breathtaking as the Goo Goo Dolls sauntered on amid dramatic,stabbing bursts of synthesised noise and white light.They piled straight into Dizzy the opening track from their album Dizzy up the Girl and as they hit the skyscraper high chorus of Slide a few numbers later, you wondered how a band could get this good without anyone noticing. In fact, the Dolls are already a very big band in America, where Dizzy Up The Girl has sold more than two million copies. But even there, success was a long time in coming. Founded in 1985, the group laboured for many years (and albums) before achieving a commercial breakthrough in 1995 with the single Name. Last year they finally hit the big time thanks to the success of Iris, from the soundtrack to the film City of Angels. The follow-up, Slide , is still in the American Top 30 almost a year after it was released. At Shepherds Bush on Saturday, the extravagantly muscled singer and guitarist John Rzeznik had his thick mop of hair concealed by a big cowboy hat which he kept jammed firmly in place all night. The effect was to make him look more like a truck driver than a rock 'n' roll star, an impression which was reinforced by his lunkhead patter between songs. Meanwhile, bass guitarist Robby Takac charged around, barefoot, with ungainly exuberance, pausing every so often to sing some of the songs himself. It was a case of group democracy detracting, Sebadoh-like, from the power and coherence of the performance as a whole. With a road-hardened sound and songwriting style located firmly in the tradition of Paul Westerberg and the Replacements, the Goo Goo Dolls presented a typically brash, American guitar-band front. But there was a tunefulness and thoughtfulness to their songs, especially the lilting Iris, with which they finished the set. Impressive too was the tremendous sense of commitment and pleasure in performing which they communicated without being in any way ingratiating towards the crowd. Some of those surly, self conscious British bands should take note.