Alziel
Warlord
The Honour opener is great for reasons other than the culture per kill. It's value will increase or decrease based on factors such as Civ choice, map size etc.
I would say that it's almost essential to get the Honour opener if you play as the Aztecs, Songhai, Germany and (to a lesser degree maybe) the Ottomans. It's value also goes up if you play on larger maps or with Raging Barbarians on.
It can also be useful if you are pursuing a City State strategy - a lot of CS's will give out 'clear encampment' or 'kill barbarian' quests early in the game and with the Honour opener you can see camps as they spawn, estimate if they are close enough to a CS to potentially trigger that quest and then send your military that way before the quest is even announced. The boost to combat strength when fighting barbarians helps with this as well.
But I'm a fan of the Honour tree as a whole and fill it out often, so I'm probably biased!
I would say that it's almost essential to get the Honour opener if you play as the Aztecs, Songhai, Germany and (to a lesser degree maybe) the Ottomans. It's value also goes up if you play on larger maps or with Raging Barbarians on.
It can also be useful if you are pursuing a City State strategy - a lot of CS's will give out 'clear encampment' or 'kill barbarian' quests early in the game and with the Honour opener you can see camps as they spawn, estimate if they are close enough to a CS to potentially trigger that quest and then send your military that way before the quest is even announced. The boost to combat strength when fighting barbarians helps with this as well.
But I'm a fan of the Honour tree as a whole and fill it out often, so I'm probably biased!