It annoys me how we have 3 ages (ancient-classical & medieval) that are supposed to cover 5000 years of history but we have 3 ages (modern, atomic, information) that cover approximately 120 years of history. I really think that in future Civ 6 (seeing as we won't see any more expansions or major patches) they need to slow the pace of technological advancement down a bit in the early ages. On higher difficulties its common to see AIs reaching the Medieval era about 800 BC & reaching the renaissance era around 500 AD. The AI typically get Civil Service by turn 70-80 and pikemen ruin game balance. A 16 strength unit that gets a +50% bonus against cavalry units well before Chivalry & Knights are accessible ruins many early game UUs. I really wish the developers had added an "extended Classical era" that lets you build units, buildings, wonders & get policies & religion at the standard speed but slows down technological research for the ancient, classical & medieval eras by about 50%. The way the game is designed now it takes about 50 turns just to get your Civilization up & running and now you're already nearly finished both of the ancient & classical eras without being able to so anything close to what the ancient Greeks & Romans did. Ancient Greece conquered much of the Mediterranean in a short space of time and built most of the classical era Wonders. The Romans were able to conquer the Greek World and expand to encompass nearly all of the Western World by 300 AD and had built the Circus Maximus & a host of infrastucture for many cities. My experience is that the closest I can get to doing this puts me well into the Medieval era as war just takes too much away from economic development. But I guess this is unlikely since there's no chance that a new expansion or major patches for Civ 5.