I agree with Baalz about EA Ryleh; I actually won an MP game with that nation. The strength of the Aboleths is in Mind Lord SCs- one random earth pick and some research will give you a truly fearsome AOE life-draining SC that can be fielded very early in the game. Later in the game, your Mind Lord and Golem SCs can teleport around wreaking havoc. Unfortunately, lobo guards are your only real troop option, and they are not so good. You live and die by your SCs as EA Ryleh.
As an aside, the first nation I eliminated in that MP game was EA Ulm.
