Kicking average statistics - over the course of an extended period of games, or even better, seasons - is one of the most useful stats there is. It will almost certainly run the gamut of range, of angle and of pressure. Yes, you'd like more in-depth statistics, but the simple percentage is still useful. Certainly, the body of evidence for Sexton leaves me happy as to his effectiveness.
Farrell? His stats are still good, but hovering around the 80pc mark in two competitions is not the stuff of legends. He appears to be mostly reclaiming his touch but it's not completely there yet. Some of the misses have been pressure matches as well. He stank the place out against Leicester at Wembley. I'd call the kick before half time against Ireland a pressure kick. And Munster away is definitely a pressure game - 42.9pc. His game against Metro was superb, an incredibly good kicking display, but it's been his only good one this HEC. 71.4pc in the home game against Munster, 66.7pc home to Embra. 73.5pc by my workings. I believe by any reasonable standard there is a greater weight of statistical evidence behind Farrell being a merely very good goal kicker at the moment, rather than the godly one he is made out to be.
However, I'm going to stop here, as I do not want the mockers remembering this post come April. Probably too late tbh...