I'm not saying Murray's bad, I'm saying there are plenty of better scrum halves around. I'm judging him on how he plays for Munster which is above average. He may become a top class player but he's not there at the moment. You're absolutely right, if he has a brilliant 6 Nations I'll laud his performances. I'm basing my opinion on the evidence I've seen thus far, not what I hope to see in the future. From what I've seen, he box kicks well, passes pretty well, is a good tackler and is a nuisance around the fringes. Against that, he kicks too often and plays with blinkers on, too often attacking the fringes himself when he'd be better off spinning it wide. I think that's a reasonable assessment.
People are criticizing Earls' impact as an outside centre, not as a winger. I'd have no qualms with picking him on the wing but don't agree with choosing him at 13. If it annoys you that I give my honest opinion on those players, so be it.