It's a really pitiful amount of culture. Honor is kind of a crappy tree, compared to Liberty and especially Tradition. It's good for specific civs that rely heavily on creeping (Songhai, Germany, Aztecs, maybe Celts). Also an alright choice for heavy domination civs like China. But I wouldn't open it just for the culture bonus, definitely not a good investment.
I agree . If you want to knock some heads off early . Go for it . There is no weak opener . Only openers that fit your strategy . Ask yourself . What is my strategy ? Once you answer your question

If you have a GG and 15% extra with adjacent melee units . That even might be enough to win you two a three important cities from a neighbor . Huge jump on the game .