Andrew Mehrtens stats I'd say are more impressive considering he scored more points per game, the same number of tries and conversions (exactly the same, not less...) and he did it in 28 less tests. Wilkinson scored many more drop goals and penalties, which wouldn't indicate he set up many tries. Daniel Carter, Grant Fox, Andrew Mehrtens and Diego Dominguez scored more points on average than Wilkinson.
My thoughts on Wilkinson are pretty simple. He was exactly what England needed in 2003. With a great forward pack and creative inside and outside options in Dawson, Greenwood and Catt, he had the accuracy, defense and composure to be very good. He's much like Morne Steyn was in 2009, extremely accurate and could control a game going forward. The problem with Wilkinson however, is that he just isn't a creative player. I thought he was overhyped by the English media to no end. I don't think he could run a backline like Larkham, Mehrtens could and Daniel Carter can, which is why I think England have struggled so much, as their forward pack hasn't been the same monster it was in 2003 and their backline was never going to be unleashed under Wilkinson (not that this was all his fault).