Hittites
Goths/Huns
Mongols
Edo Japanese/Poles
British
Americans/Indians
Generally agree, though I think Hittites have a place. And Hittite > Huns are a great way to decide the game militarily before you build a single EQ. The combo between their EU and LT turns an army of both EU into a dominant classical force. Admittedly I didn’t face Greeks or Persians in that game, but I found I got stars fast enough to then turn my massive territories into large productive cities before long.
America and India break my rule of offering something useful for CE era stars. America is designed to fit into a game that simply does not exist, as it’s seems like mostly just a chance to RP red dawn in a PVP game.
British seem stuck back in open dev when having vassals was so strong. But a stronger line infantry wins games (cf Italians).
Poles wouldn’t be nearly so bad if any combat in this era occurred outside of city walls, but it doesn’t. This might therefore save the Mongols for the EU upgrade, but it doesn’t.
Edo Japanese have an exceptional and flavorful EU that is well timed at the beginning of EM and much more aggressive than the Ming’s, while giving a smaller influence boost that is immediate (plus a handful of EQ if spots exist). The Ming EQ is quite the investment to put everywhere.
Mexicans > Chinese is very powerful, providing all the extra workers for their EQ. When picking Mexicans, you aren’t just doing it for the food, you’re doing it for a [Winnebago]-load of food!
Therefore my list pick for two worst cultures would be Americans and Poles. They aren’t good, but they also aren’t fun. Poles would be much improved if you could edit the size of territories (eg have a huge map with the # territories and players as a regular map).