He had 7 goals & 16 assist in 35 matches for Marseille last season. This season he has 11 goals and 7 assist for in 29 matches for West Ham, not that statistics tell the whole story. He's having a career year; He, Mahrez, & Kante have been the EPL's best players.
But he created an obscene amount of chances. It wasn't his fault people weren't scoring them. In fact he also has created a lot more chances for West Ham than his stats would suggest. He has created over 60 chances. e.g. Barkley has 11 assists and has created just over 30 chances.