It depends on a number of factors and there isn't just one figure.
Certainly 30m out with little to no angle I'd expect an AFL footballer to be nailing it at least 80% of the time, even that feels a little low.
Doesn't take into account the freakish ones he does get, when they're a 0% chance.
It's not unreasonable to ask for a realistic expectation of his scoring conversions - it's an average percentage, so it takes into account the freakish and the simple.
60%?
70%?
80%?
Overall, what's reasonable?
What you're missing is when and from where he misses them. That's what I'm interested in, not a fluffed up conversion statistic.
Indulge me then.
Or if it turns out he has a decent conversion ratio, is the argument going to be that he misses the easy ones but nails the hard ones, so the ratio is irrelevant?
Kurt's goal kicking is an issue, I'm not disputing that, but let's not ignore all of the great work he does because he missed a couple of easy ones - which everybody does from time to time.