I think you're being too harsh. He was never intended to be a revolutionary signing for the price we paid for him. Compared to the rest of our offensive minded players, he's been the most consistent at tracking back to defend. And to your point of scoring decisive goals.
People are quick to forget how bad Kalou was at times, at least Moses can beat his man 1 on 1. While I agree he needs to improve his passing, he can still do damage on the wing with his pace and trickery.