Egypt is annoying and irritating anyway, just because of their pharaonic buildup and their stupendous unit lineup (even though by playing the Total Realism Mod I don't have to live with the stupid names anymore - I do have to live with the ridiculisly overpowered "native" units though) they are way too overpowered in vanilla RTW, their levy units are better than most factions top notch units, they attack the Seleucids out of the blue, even if they were allied for only a couple of turns (you can tell I've played a couple of Seleucid campaigns, can't you?) they bring in army after army after army... did I mention I hate the "pharaonic colour" of this faction?

Also, when playing as the Greek Cities, I find the Brutii (allthough rather weak) extremely irritating. They will land a smallish army in Athens every other turn, besiege, get trashed, repeat the next turn and over and over again... I really hate this.