Egypt, the one faction everyone loves to hate.
The main concern with Egypt is the amount of settlements that are buffed up (a few start with stone walls), and many of them are cashcows (though not as bad as the Greek islands). When I play as Numidia, I try to expand to the NW toward Spain. I'd rather take my chances with barbaric Gauls than buff Egyptians.
On the other hand, when I have had a bad day at work and need to unwind, Egypt is the best faction for me to play with for the very same reason. I dont need my stress levels elevated any more than needed, so playing an overpowered faction and zergrushing anything that stands in my way is a good way of venting a lot of steam.