Indonesia and Portugal alway getting eatten by some warmonger.
The Mongols can sometimes be scary.
Pasiv Civs with no real Special Unit bonus will end up with a low military score and be the punching back of almsot everyone.
I had two games with indonesia becoming a military powerhouse and a contender for a victory. In one of these games, they totally conquered the Netherlands...
I agree that the Mongols are usually subpar, though any civ can become a powerhouse, given enough luck. The problem with the AI though is, that they do not always understand to (ab)use their special units. Mongols sucking on Archipelago is understandable. On Pangea less so. Plus diplo hit for warmongers is so crippling since BNW, that usually all other AIs gang up on Mongolia when they begin to conquer CS.