That's fair. I guess the idea is to spam them.
Sparta still seems to be lacking late game, at least stats wise. Best strategy I've found is to make 5 or 10 battering rams, load them up with Skiritai and basically use them as a wave of armored personnel carriers.
Let the Skiritai out en masse to deal with enemy units while the battering rams go to work on buildings.
On a slightly different note, I will say I think the Scythian archers the Athenians have access to might be the most underrated range unit in the game. 14 pierce attack, 60m range, and 1 sec attack interval out the gate. When I had them fully upgraded, it was something like 27 pierce damage... put on top of walls, their range went up by another 11 meters on average. Holy smokes.