A starting point of three years for aggravated assault causing harm (maximum five years) was manifestly excessive where the offender played a subsidiary role and had a borderline to mild intellectual disability. The intellectual disability diminished both the importance of deterrence and the offender's moral culpability. A complaint that a sentencing judge failed to have adequate regard to a material factor does not disclose appealable error; it is in the nature of discretion that judges give varying weight to considerations. Where a sentencing judge makes an arithmetic error in calculating a guilty plea discount but the appellate court would impose the same sentence, the appeal should be dismissed applying Kentwell.
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