There are many conclusions that we can draw about Odysseus as a leader of the Greeks, but one characteristic stands out above the rest. We read about him in Homer's great poems, the Iliad and Odyssey.
We can say that Odysseus is a good solider, who has the respect of his peers. More specifically, he stands out as the cleverest of the Achaeans or Greeks. He (along with Nestor) is the best speaker, and so he is able to convince people. For example, in the Iliad, he is able to mediate between Agamemnon and Achilles. In fact, he is the only one who is able to do this. In addition, according to tradition, he is the one who created the artifice of the Trojan horse, which shows again that he is clever.
This point is confirmed in the Odyssey. For example, no matter what happens, Odysseus is able to find a way. He proves to be resourceful in the land of the Lotus eaters, the cyclopes, Circe, and even during his homecoming, when he uses many disguises.
In light of these point, we can say that Odysseus is the paragon of one aspect of a Greek leader--he is resourceful.