About Greece, I'd first say : there is no single united entity in Greece before the Roman Empire came and invaded it ! Thus one should not speak of Greece but of Athens, Sparta, Corinth, etc.
On statehood, most cities were probably low : administration was much less developped than in the roman empire (although not that far away from what did exist during the roman republican period).
On accountability, Athens should probably get a rather good rating, at least from the time of Pericles to the time of Philipp II of Macedonia. Every elected/nominated official had to give official accounts of his actions when he came out of office and could be prosecuted for those actions. In Sparta, the rating would probably be medium since the Kings were always controled by the Ephors, but the Ephors were close to immune.
On rule of law, I'd say that Athens would rate medium for while justice was easy to access (even for non-citizens), we have many cases of political abuse of the tribunals and justice worked also mainly for citizens and non-citizens of subject from the athenian empire's other cities had more difficulties to be heard. In Sparta I'd probably rate the rule of law as rather medium too.
Thus :
Athens : low - high - medium
Sparta : low - medium - medium