The main problem is at the moment that in a team with 1 vs 3, where the 3 contains at least 1 AI, the 1 has a pretty major advantage because the AI is so bad it just feeds gold, until the guy on his own is unkillable by the other team.
We've been saying this for a while, but just gonna get behind Caldur and agree that advantage in Demigod has nothing to do with team numbers. 1 experienced player can beat three new players or AI every time. 2 experienced players who work well together can beat any number of new players or nightmare AI every time.
I like the asymmetrical teams in theory, but in practice you get more kill feeds from a larger team, not more challenge.