I think one of the problems is that when he takes a free kick,his own team mates don't know what he is going to do.For example yesterday he took a free kick from outside the area on the left hand side and tamely hit it straight into the keepers hands when everyone was waiting at the far post and nobody else moved to try to fool the keeper into indecision.I've seen this happen many times this season included an appalling one at Southampton last week with a few minutes left we had all the big guns waiting at the far post for a good delivery and he hopeleesly blasted the ball way over the bar.
Yes I do think we have others who are just as capable,if not better at delivering good balls into the box,particularly the full backs.