GamerDad has posted their review of Civ4 Warlords (http://www.gamerdad.com/detail.cfm?itemID=3333), giving the expansion 4.5 out of 5 stars. Here is a quote:

One great thing about the original that made it great for kids was the breadth of difficulty levels. Take on ‘Settler' level and you can make many terrible mistakes and still end up winning the game. Work your way on up at your own pace and you are rewarded with greater satisfaction, and punished more and more for every mistake. Just like the original, you need to pay attention to what is going on throughout your territory. You can automate many tasks, but you still need to maintain balance in all of your cities, ensure trade and security, and develop the right technologies and culture in the right areas if you hope to win. The additional cultures and historical scenarios only serve to strengthen the reasons why this is a great game for kids. You can easily build a history buff with this game, one turn at a time.
PC Format UK magazine also reviewed the expansion in its September issue and gave it 77% rating.