He wasn't great. He was as good as what you would expect such an expensive player to be. I'm sorry but for 50m you should get a player who does occasionally best his man and does finish off a clear one vs one.
Sterling's problem isn't 'finishing and composure'. His problem is far deeper than that. He simply doesn't strike the ball cleanly. Even when he is passing. He doesn't even control the ball cleanly when receiving passes and he often leaves the ball behind him when he dribbles. He just isn't a technically clean footballer.
Not only that, but by playing him on the left wing we are negating his main asset.
Amen