What do I mean with that title ? That many of the possible cool additions will be able to hurt the human player but not the AI which plays by different rules anyway. Happines penalty because of a neighbor with strong tourism and a different ideology ? Doesn't mean a thing. AI civs play with virtually unlimited happines. World Congress can globally increase unit maintenance to encourage demobilization ? AI players have massive discounts (and let's not even get started on Germany). I also predict some major annoyances. 1.) Trade routes will get pillaged all the time. If you ever tried to spread a religion past the classical era you will have noticed the ridiculous amount of units restricting the movement of your missionaries and prophets. Now trade units seem to be in a different category and won't have problems with stacking, but how are you going to protect them from a third party that has open borders with your trade partner or barbarians that the AI is too incompetent to exterminate ? Your trade partner's military won't only fail to protect your trade routes, it will also prevent you from doing it by blocking the way for your untis. 2.) Trade routes will be broken by ICS. Somebody -probably Rome or Russia- will keep spamming cities near you and you won't be able to have more than one or two land trade routes that don't go through a hostile civs territory. 3.) Culture victories will be too easy. The only reason AI civs are now able to sometimes keep up with your policies is becasue, they yet again, get a huge polica cost discount. They generate very little culture on their own through focused building strategies or the use of specialists. This means that unless the AI or the culture mechanics are changed, AI players will retain their pitiful culture production and once you have made contact with every civ it will be depressingly easy for any semi-competent player to overwhelm them with tourism. 4.) Archeologists + 1UPT + AI ICS. Need I elaborate ? I'd love to be optimistic, but unless the AI gets a major overhaul Brave New World will add at least as much fury as fun to Civ 5. I'm sure others here can think of more issues like the ones I've posted.