I've seen four leaders which play constantly poor (8 games out of 10): Washington, Suleiman, Montezuma and Kamehameha.
Of course, there are exceptions to every rule: In one recent game (a map with 3 continents), Monty allied Bismarck on one continent and they both took out Suleiman and Oda, on the second continent Washington with Hiawatha took out Siam and Greece.
Of course, there are exceptions to every rule: In one recent game (a map with 3 continents), Monty allied Bismarck on one continent and they both took out Suleiman and Oda, on the second continent Washington with Hiawatha took out Siam and Greece.