I have not experienced such a level of AI worker incompetence in my games, pre or post patch, King and Emperor level. I do not play with raging barbs, however, as that can really mess with an AI civ during crucial expansion periods. I do think the AI could do better with escorting all types of civilian units. I think the biggest fail with the game is the AIs handling of water based maps. It is far too easy to pick off embarked units, thus making invasions of your country almost non existent.