I was ready to give up on Discovery until they beat the cloaked Klingon ship and then jumped into the mirror universe.
Up till then it had been pretty dull and dour and miserable without any light or humour. After they went into the mirror universe, it got pretty good and managed to maintain it when they go back. The production design is baffling considering the timeframe, and Burnham is unfortunately the least interesting character (with the most interesting - Isaacs and Yeoh - now both absent). But I think there's definitely potential now.