>>17992929 (OP)
They were just mediocre and unremarkable. Their was records show just as much, and they didn't perform any better than their non-militaristic rivals. What the Spartans excelled in was propaganda, much like the modern day USMC.
>>17994396
No, the delaying action was a complete failure. Not only did they fail to delay the Persians significantly, they failed to inflict major casualties on the Persian forces. The battle was such a humiliating defeat for the Greeks, that they were later forced to spin the tale into a heroic last stand.