I might agree with Myth's analysis for PvP mode, though I feel that in the right hands, the Seleucids will be a force. They are more spread than Egypt, and more open to attack from different directions, but nonetheless, the HA factions have crappy infantry and the HA can be countered early by "Creeshans" which the Selkies have immediate access to (unfortunately for the GC, the Seleucids go first and can nab the first two in Anatolia before them).

As long as the Seleucids stick to their cities, early on, the HA factions will have trouble assaulting. Egypt will have to watch its' back as there are some here who are pretty darn good with Numidia