I am following the lean model ... what is acceptable or good feedback rate?

Hello everybody, Im following the lean methodology and I'm running some tests and questionnaries for my startup(Logo, Ident, Mascot and a general idea of the brand). In general, I'm getting positive feedback. But as I was especting, not everybody likes it.

My question is, when should I be happy with the percentage of positive feedback? 70%? 80%? 90%?